EXERCISE 1(A)
Question 1:
Rajat purchases a wrist costing Rs. 540. The rate of sales tax is 8%. Find the total amount paidby rajat for the watch.
Solution 1:
Sale price of watch= Rs. 540
Rate of sales tax= 8%
Total amount paid by Rajat = Rs. 540 + 8% of Rs. 540
= Rs. 540 + 8
100
× 540
= Rs. 540 + Rs. 43.20
= Rs. 583.20 Ans
Question 2:
Ramesh paid Rs. 345.60 as sales tax on a purchase of Rs. 3,840. Find the rate of sales Tax.Solution 2:
Sale price = Rs. 3,840
Sales tax paid = Rs. 345.60
∴ Rate of sales tax = sales tax
sales price
×100%
=
345.60
3,840
×100%
= 9% Ans.
Question 3:
The price of a washing machine, inclusive of sales tax, is Rs. 13,530/-. If the sales tax is 10%,Find its basic (cost) price.
Solution 3:
Selling price of washing machine = Rs. 13,530
Rate of sales tax = 10%
∴ Cost Price = selling price ×100
100+Rate of sales tax
=
13530 ×100
100+10
=
1353000
110
= Rs. 12,300
Question 4:
Sarita purchases biscuit costing Rs. 158 on which the rate of sales tax is 6%. She also purchasessome cosmetic goods costing Rs. 354 on which the rate of sales tax is 9%. Find the total amount
to be paid be sarita.
Solution 4:
Sale price of biscuits = Rs. 158
Rate of sales tax on biscuits = 6%
Amount paid for biscuits = Rs. 158 + 6% of Rs. 158
= Rs. 158 + 6
100
×158
= Rs. 158 + Rs. 9.48
= Rs. 167.48
Sale price of cosmetic goods = Rs. 354
Rate of sales tax = 9%
Amount paid for cosmetic goods = Rs. 354 + 9% of Rs. 354
= Rs. 35 + 9
100
×354
= Rs. 354 + Rs. 31.86
= Rs. 385.86
Total amount paid by Sarita = Rs. 167.48 + Rs. 385.86
= Rs. 553.34 Ans.
Question 5:
Hamid purchased some articles costing Rs. 5460. The shopkeeper charged sales tax at 8%. Ashamid wanted to take the articles purchased outside the state, the shopkeeper charged 3% as
central sales tax on the actual price of the articles. Find the total amount Hamid Had to pay for
the articles.
Solution 5:
Sale price of articles = Rs. 5,460
Rate of sales tax = 8%
Rate of central sales tax = 3%
Total amount paid by Hamid
= Rs. 5,460 + 8% of Rs. 5,460 + 3% of Rs. 5,460
= Rs. 5,460 + 8
100
×5,460 +
3
100
×5,460
= Rs. 5,460 + Rs. 436.80 + Rs. 163.80
= Rs. 6060.60 Ans
Question 6:
The marked price of two articles A and B together is Rs. 6,000. The sales tax on articles A is8% and that on article B is 10%. If on selling both the articles, the total sales tax collected is Rs.
552, find the marked price of each of the articles A and B.
Solution 6:
Let the marked price of article A be Rs. x and article B be Rs. y.
The marked price of A and B together is Rs. 6,000.
⇒ x + y = 6,000 …….. (i)
The sales tax on article A is 8% and that on article B is 10%.
Also the total sales tax collected on selling both the articles is Rs. 552.
⇒ 8% of x + 10% of y = 552
⇒ 8x + 10 y = 55,200 …….. (ii)
Multiply equation (i) by 8 and subtract it from equation (ii) we get,
2 y = 7,200
⇒ y = 3,600
Substituting y = 3,600 in equation (i) we get,
x + 3,600 = 6,000
⇒ x = 2,400
The marked price of article A is Rs. 2,400 and article B is Rs. 3,600.
Question 7:
Tanya buys a leather coat costing Rs. 3,600, the rate of sales Tax being 10%. She asks theshopkeeper to reduce the price of the coat to such an extent that she does not have to pay anything
more than Rs. 3,366 including sales tax. Calculate:
(i) The reduction needed in the cost price of the coat.
(ii) the reduction as percent.
Solution 7:
(i) Let new sale price of coat = Rs. y
Rate of sales tax = 10%
Total amount paid= Rs3,600
According to question
Y + 10% of Y = Rs. 3,366
⟹ y +
y
10
= Rs. 3,366
⟹
11y
10
= Rs. 3,366
⟹ y =
3,366 ×10
11
= Rs. 3,060
Reduction needed in the price= Rs. 3,600 − Rs. 3,060 = Rs. 540 Ans.
(ii) Reduction % = 540 ×100
3600
= 15%
Question 8:
The price of a T.V. set inclusive of sales tax of 9% is Rs. 13,407. Find its marked price. If Salestax is increased to 13%, how much more does the customer has to pay for the T.V.?
Solution 8:
(i) Total price paid for T.V. = Rs. 13,407
Rate of sales tax = 9%
Let sale price = Rs. y
According to question
Y + 9% of y = Rs. 13,407
⟹ y + 9y
100
= Rs. 13,407
⟹
109y
100
= Rs. 13,407
⟹ y =
13,407 ×100
109
= Rs. 12,300
If the sales is increased by 13% then 13% of 12300
= Rs. 12,300 + Rs. 1,599
= Rs. 13,899
More money paid = Rs. 13,899 – Rs. 13,407 = Rs. 492 Ans.
Question 9:
The price of an article is Rs. 8,250 which includes sales tax at 10%. Find how much more or
less does a customer pay for the article, if the sales tax on the article:
(i) increases to 15%
(ii) decreases to 6%
(iii) increases by 2%
(iv) decreases by 3%
Solution 9:
Let sale price of article = Rs. yTotal price inclusive of sales tax = Rs.8,250
Rate of sales tax = 10%
According to question
Y + 10 % of y = Rs. 8,250
⟹ y + y
100
= Rs. 8,250
⟹
11𝑌
10
= 𝑅𝑠. 8,250
⟹ y =
8,250 ×10
11
= 𝑅𝑠. 7,500
(i) New rate of sales tax = 15%
New total price = Rs. 7,500 + 15% of Rs. 7,500
= Rs. 7,500 + 15
100
×7,500
= Rs. 7,500 + Rs. 1,125 = Rs. 8,625
More money paid = Rs. 8,625 – Rs. 8,250 = Rs. 375 Ans.
(ii) New rate of sales tax = 6%
New total price= Rs. 7,500 + 6% of Rs. 7,500
= Rs. 7,500 + 6
100
×7,500
= Rs. 7,500 + Rs. 450 = Rs. 7,950
Less money paid = Rs. 8,250 – Rs. 7,950 = Rs. 300 Ans.
(iii) New rate of sales tax = (10 + 2)% = 12%
New total price = Rs. 7,500 + 12% of Rs. 7,500
= Rs. 7,500 + 12
100
×7,500
= Rs. 7,500 + Rs. 900 = Rs. 8,400
More money paid = Rs. 8,400 – Rs. 8,250 = Rs. 150 Ans.
(iv) New rate of sales tax = (10 − 3)% = 7%
New total price = Rs. 7,500 + 7% of Rs. 7,500
= Rs. 7,500 + 7
100
×7,500
= Rs. 7,500 + Rs. 525 = Rs. 8,025
Less money paid = Rs. 8,250 – Rs. 8,025 = Rs. 225 Ans.
Question 10:
A bicycle is available for Rs. 1,664 including sales tax. If the list price of the bicycle is Rs. 1,600find:
(i) the rate of sales tax.
(ii) the price, a customer will pay for the bicycle if the sales tax is increased by 6%.
Solution 10:
Price of bicycle inclusive of sales tax = Rs. 1,664
List price of bicycle = Rs. 1,600
(i) Sales tax = Rs. 1,664 – Rs. 1,600 = Rs. 64
∴ Rate of sales tax = sales tax
sales price
×100% =
64
1,600
×100% = 4% Ans.
(ii) New rate of sales tax = (4 + 6)% = 10%
New total price = Rs. 1,600 + 10% of Rs. 1,600
= Rs. 1,600 + 10
100
×1,600
= Rs. 1,600 + Rs. 160
= Rs. 1,760 Ans.
Question 11:
When the rate of sale – tax is decreased from 9% to 6% for a coloured T.V; mrs. Geeta will saveRs. 780 in buying this T.V. Find the list price of the T.V.
Solution 11:
Let the list price of T.V. = y
Sales tax when the rate is 9% =
9
100
𝑌
⟹ Sale price is y + 9𝑦
100
Sales tax when the rate is 6% =
6
100
𝑦
⟹ Sale price is y + 6
100
𝑦
Differences of sale prices
= y +
9𝑦
100
− (𝑦 +
6𝑦
100)
= y +
9𝑦
100
− y −
6𝑦
100
=
9𝑦
100
−
6𝑦
100
Savings for Geeta = 784.
Therefore, we have,
784 = 9𝑦
100
−
6𝑦
100
⟹
3𝑦
100
= 78
⟹ y =
78×100
3
⟹ y = Rs. 26,000
Thus the list price of the T.V. is Rs. 26,000 Ans.
Question 12:
A shopkeeper sells an article for Rs. 21,384 including 10% sales tax. However, the actualrate of sales tax is 8%. Find the extra profit made by the dealer.
Solution 12:
Price of the article inclusive of sales tax = Rs. 21,384
Let y be the list price of the article
Rate of sales tax charged by the shopkeeper = 10%
According to the given statement, we have
21384 = y + y ×
10
100
⟹ y + 𝑦
10
= 21384
⟹
11𝑦
10
= 21384
⟹ y =
21384 ×10
11
⟹ y = Rs. 19440
When the sales tax is 8%, the actual sale price
= 19440 + 19440 × 8
100
= Rs. 20,995.2
Extra profit = Sale price of the article charged by shopkeeper − Actual sale price
⟹ Extra profit = Rs. 21,384 - Rs. 20.995.2 = Rs. 388.80 Ans.
EXERCISE 1(B)
Question 1:
A trader buys an unfinished article for Rs. 1,800 and spends Rs. 600 on its finishing, packing,transportation, etc. He marks the article at such a price that will give him 20% profit. How much
will a customer pay for he article including 12% sales tax.
Solution 1:
Purchase price = Rs. 1,800
Expenditure = Rs. 600
Total price = Rs. 1,800 + Rs. 600 = Rs. 2,400
M.P. of article = Rs. 2,400 + 20% of Rs. 2400
= Rs. 2,400 + 20
100
×2,400
=Rs. 2,400 + Rs. 480 = Rs. 2,880
Cost price for customer = Rs. 2,880 + 12% of Rs. 2,880
= Rs. 2,880 + 12
100
×2,880𝑆
= Rs. 2,880 + Rs. 345.60
= Rs. 3,225.60 Ans.
Question 2:
A shopkeeper buys an article for Rs. 800 and spends Rs. 100 on its transportation, etc. He marksthe article at a certain price and then sells it for Rs. 1,287 including 10% sales tax. Find this
profit as per cent.
Solution 2:
C.P. of an article = Rs. 800
Expenditure = Rs. 100
Total C.P.= Rs. 800 + Rs. 100 = Rs. 900
Let sale price = Rs. y
Sale price inclusive of sales tax = Rs. 1,287
Rate of sales tax = 10%
Then y + 10% of y = Rs. 1,287
⟹ y + 𝑦
10
= 𝑅𝑠. 1,287
⟹
11𝑦
10
= 𝑅𝑠. 1,287
⟹ y = Rs. 1,287 ×10
11
= 𝑅𝑠. 1,170
His profit = Rs. 1,170 – Rs. 900 = Rs. 270
His profit% = 270
900
×100% = 30% Ans
Question 3:
A shopkeeper announces a discount of 15% on his goods. If the marked price of an article, inhis shop is Rs. 6,000; how much a customer has to pay for it, if the rate of sales tax is 10%?
Solution 3:
Marked price of article = Rs. 6,000
Sale price after discount = Rs. 6,000 − 15% of Rs. 6,000
= Rs. 6,000 − Rs. 900
Rs. 5,100
Rate of sales tax = 10%
Cost price for customer = Rs. 5,100 + 10% of Rs. 5,100
= Rs. 5,100 + Rs. 510
= Rs. 5,610
Question 4:
The catalogue price of a colour T.V. is Rs. 24,000. The Shopkeeper gives a discount of 8% onthe list price. He gives a further off season discount of 5% on the balance. But sales tax at 10%
is charged on the remaining amount find.
(a) the sales tax a customer has to pay.
(b) the final price he has to pay for the T.V.
Solution 4:
List price of T.V = Rs. 24,000
Discount % = 8 %
Season discount = 5%
∴ Sale price = Rs. 24,000 (1 −
8
100) (1 −
5
100)
= 24,000 ×
92
100
×
95
100
= 𝑅𝑠. 20,976
Rate of sales tax = 10%
Sales tax = Rs. 20,976 ×
10
100
= 𝑅𝑠. 2,097.60
Final price for customer = Rs. 20,976 + 10% of Rs. 20,976
= Rs. 20,976 + 10
100
× 20,976
= Rs. 20,976 + Rs. 2,097.60
= Rs. 23,073.60 Ans
Question 5:
A shopkeeper marks his goods 40% above the cost price and then allows discount of 20% findhow much will a customer pay for an article which costs the shopkeeper Rs. 200 and a sales tax
of 10% is levied on the sale price of the article. (Give your answer correct to the nearest rupee).
Solution 5:
Cost price = Rs. 200
Marked price = Rs. 200 + 40% of Rs. 200
= Rs.200 + Rs. 80 = Rs. 280
Discount = 20%
Sale price = 280 (1 −
20
100)
= 280 ×
4
5
Rate of sales tax = 10%
Price for customer = 224 + 10% of 224
= 224 + 10
100
×224
= 224 + 22.4
= 246.4
= 246 (Approx)
Question 6:
A toy is purchased for Rs. 591.36 which includes 12% rebate on the printed price and 12% salestax on the sale price of the toy find the printed price of the toy.
Solution 6:
Let printed price = Rs. y
Discount% = 12%
∴ Sale price = Rs. y (1 −
12
100) = y ×
88
100
= Rs.
22 y
25
Rate of sales tax = 12%
Purchase price= Rs. 591.36
According to question
Sale price + sales tax = Rs. 591.36
Rs.
22y
25
+ 12% of 22y
25
= Rs. 591.36
⟹
22y
25
+ 66y
625
= Rs. 591.36
⟹
616y
625
= Rs. 591.36
⟹ y =
591.36 ×625
616
= Rs. 600 Ans
Question 7:
The catalogue price of an article is Rs. 20,000. The dealer allows two successive discounts 15%and 10%. If sales tax at the rate of 10% is charged on the remaining amount. Find:
(i) the sales tax amount a customer has to pay.
(ii) the final total price that customer has to pay for the article.
Solution 7:
Catalogue price = Rs. 20,000
Two successive discounts = 15% and 10%
Sale price = 20,000 (1 −
15
100) (1 −
10
100)
= 20,000 × 17
20
×
9
10
Rate of sales tax = 10%
Sales tax = 10% of 15,300
=
10
100
×15,300 = 𝑅𝑠. 1,530
Final total price = Rs. 15,300 + Rs. 1,530 = Rs. 16,830
Question 8:
A trader buys an article for Rs. 1,700 at a discount of 15% on its printed price. He raises theprinted price of the article by 20% and then sells it for Rs. 2,688 including sales tax on the new
marked price. Find:
(i) the rate of sales tax
(ii) the trader’s profit as per cent
Solution 8:
Let the printed price = Rs. y
Discount% = 15%
Cost price = Rs. 1,700
∴ list price – discount = Rs. 1,700
⟹ y – 15% of y = Rs. 1,700
⟹ y -
3𝑦
20
= 𝑅𝑠. 1,700
⟹
17𝑦
20
= 𝑅𝑠. 1,700
⟹ y = Rs. 1,700 ×20
17
= 𝑅𝑠. 2,000
New printed price = Rs. 2,000 + 20% of Rs. 2,000
= Rs. 2,000 + 20
100
×2,000
= Rs. 2,000 + Rs. 400 = Rs. 2400
Selling price inclusive of sales tax = Rs. 2,688
Sales tax = Rs. 2,688 – Rs. 2,400 = Rs. 288
(i) ∴ Rate of sales tax = sales tax
sales price
×100%
=
288
2,400
×100% = 12%
(ii) Profit = Rs. 2,400 – Rs. 1,700 = Rs. 700
∴ Profit % = profit
cost price
×100% =
700
1,700
×100% = 41 3
17
% Ans.
Question 9:
A shopkeeper buys an article at a rebate of 20% on its marked price and then spends Rs. 300 onits transportation, etc. If he sells the article for Rs. 4,160 (Including sales tax at the rate of 4%
of the marked price), find the shopkeeper’s profit as per cent.
Solution 9:
Sale price including sales tax = Rs. 4,160
Let sale price = Rs. y
Rate of sales tax = 4%
∴ y + 4% of y = Rs. 4160
⟹ y + y/25
= Rs. 4,160
⟹
26𝑦
25
= 𝑅𝑠. 4160
⟹ y = Rs. 4,160 ×25
26
= Rs. 4,000
Purchase price = Rs. 4,000 − 20% of Rs. 4,000
=Rs. 4,000 – Rs. 800= Rs. 3,200
Extra expense = Rs. 300
Then total cost price = Rs. 3,200 + Rs. 300 = Rs. 3,500
His profit = Rs. 4,000 – Rs. 3,500 = Rs. 500
∴ Profit% = profit
cost price
×100%
=
500
3,500
×100% =
100
7
% = 14 2
7
% Ans
Question 10:
A shopkeeper buy an article for Rs. 2,400 from a wholesaler at 20% rebate on its list price. Hemarks up the list price of the article bought by 10% and then sells it for Rs. 3,498 including sales
tax on the marked up price.
Find: (i) the rate of sales tax
(ii) the shopkeeper’s profit as per cent.
Solution 10:
Let the printed price = Rs. y
Discount% = 20%
Cost price = Rs. 2,400
∴ List price – discount = Rs. 2,400
⟹ y − 20% of y = Rs. 2,400
⟹ y −
𝑦
5
= 𝑅𝑠. 2,400
=
4𝑦
5
= 𝑅𝑠. 2,400
= y = Rs. 2,400 ×5
4
= Rs. 3,000
New printed price = Rs. 3,000 + 10% of Rs. 3,000
= Rs. 3,000 + Rs. 300 = Rs. 3,300
Selling price inclusive of sales tax = Rs. 3,498
Sales tax = Rs. 3,498 – Rs. 3,300 = Rs. 198
(i) ∴ Rate of sales tax = sales tax
sales price
×100%
=
198
3,300
×100% = 6%
(ii) Profit = Rs. 3,300 – Rs. 2,400 = Rs. 900
∴ Profit% = profit
cost price
×100% =
900
2,400
×100% = 37.5% Ans.