Discount
 A tradesman allows a discount of 15% on the marked price. How much above the cost price must he mark his goods as to gain 19%?

 34%
 40%
 25%
 30%

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Here, r = 15% and R = 19%
∴ Requirement percentage = [(r + R) / (100  r)] x 100%Correct Option: B
Here, r = 15% and R = 19%
∴ Requirement percentage = [(r + R) / (100  r)] x 100%
= [(15 + 19) / (100  15)] x 100% = [(34 x 100) / 85 ] % = 40%
 If marked price of an article an article is 30% more than its cost price and 10% discount is given, then profit per cent is

 18^{1}/_{2}%
 20%
 1^{1}/_{2}%
 17%

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Here, r = 30% and r_{1} = 10%
∴ Profit per cent = [{r x (100  r_{1})}/100]  r_{1}
= [30 x (100  10)/100]  10Correct Option: D
Here, r = 30% and r_{1} = 10%
∴ Profit per cent = [{r x (100  r_{1})}/100]  r_{1}
= [30 x (100  10)/100]  10
= [30 x 90/100]  10
= 27 10 = 17%
 If a shopkeeper sold a book with 20% profit after giving a discount of 10% on marked price. The ratio of cost price and marked price of the book is

 6 : 5
 5 : 6
 3 : 4
 2 : 3

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Let the marked price of book = ₹ N
Selling price after 10% discount = 90N/100 = ₹ 9N/10
Profit = 20%
∴ Cost price of book = (9N/10) x (100N/120) = ₹ 3N/4Correct Option: C
Let the marked price of book = ₹ N
Selling price after 10% discount = 90N/100 = ₹ 9N/10
Profit = 20%
∴ Cost price of book = (9N/10) x (100N/120) = ₹ 3N/4
Hence, required ratio = 3N/4 : N = 3 : 4
 A shopkeeper marked 50% more price than cost price of the article . If he allows 30% discount to his customers, then his profit per cent is

 5%
 10%
 12%
 15%

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Here, r = 50% and r_{1} = 30%
∴ Gain per cent = [r(100  r_{1})/100]  r_{1}Correct Option: A
Here, r = 50% and r_{1} = 30%
∴ Gain per cent = [r(100  r_{1})/100]  r_{1}
= [50 x (100  30)/100]  30
= 35  30 = 5%
 A man purchased a shirt and pant with a discount of 25% on its marked price. He sold them at a price 40% more than the price at which he bought them. How much percent the new selling price to its marked price?

 5%
 7.5%
 9%
 12.5%

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Let the original price of pant and shirt be = ₹ N.
∴ Cost price of point and shirt = [N x (100  25)]/100 = ₹ 3N/4
And selling price of shirt and pant = (3N/4) x (100 + 40)/100 = (3N/4) x (140/100)
= ₹ 21N/20Correct Option: A
Let the original price of pant and shirt be = ₹ N.
∴ Cost price of point and shirt = [N x (100  25)]/100 = ₹ 3N/4
And selling price of shirt and pant = (3N/4) x (100 + 40)/100 = (3N/4) x (140/100)
= ₹ 21N/20
Hence, required percentage
= [(21N/20  N)/ N] x 100 % = 100 / 20 % = 5%