Discount
 Two successive discounts of 20% and 20% are equivalent to a single discount of

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Given, r_{1} = 20% and r_{2} = 20%
∴ Single discount equal to r_{1} and r_{2}
= (r_{1} + r_{2}  r_{1} x r_{2}) / 100 %Correct Option: C
Given, r_{1} = 20% and r_{2} = 20%
∴ Single discount equal to r_{1} and r_{2}
= (r_{1} + r_{2}  r_{1} x r_{2}) / 100 %
= (20 + 20  20 x 20) / 100
= 40  4 = 36%
 On a 20 % discount sale, an article costs 596 . What was the original price of the article ?

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Let the original price of be N .
∴ At discount of 20% article costs ₹ 596
∴ 596 = (80 x N)/100Correct Option: C
Let the original price of be N .
∴ At discount of 20% article costs ₹ 596
∴ 596 = (80 x N)/100
⇒ N = (596 x 100)/80
∴ N = 745
∴ original price = ₹ 745
 If an electricity bill is paid before due date, one gets a reduction of 4 % on the amount of the bill . By paying the bill before due date, a person got a reduction of ₹ 13 . The amount of his electricity bill was

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Let amount of electricity bill = ₹ N
∴ 4% of N = 13
⇒ (4 x N)/100 = 13Correct Option: C
Let amount of electricity bill = ₹ N
∴ 4% of N = 13
⇒ (4 x N)/100 = 13
⇒ N = 13 x 25 = ₹ 325
 Successive discounts of 10%, 20% and 30% is equivalent to single discount of?

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Here, r_{1} = 10 %, r_{2} = 20% and r_{3} = 30%
∴ Required discount
= [1  (1  r_{1}/100) (1  r_{2}/100) (1  r_{3}/100)] x 100%Correct Option: B
Here, r_{1} = 10 %, r_{2} = 20% and r_{3} = 30%
∴ Required discount
= [1  (1  r_{1}/100) (1  r_{2}/100) (1  r_{3}/100)] x 100%
= [1  (1 10/100) (1  20/100) (1  30/100)] x 100%
= {1  (9/10) x (4/5) x (7/10)} x 100%
= (1  0.504) x 100% = 49.6%
 A shopkeeper has announced 14% rebate on marked price of an article. If the selling price of the article is ₹ 645, then the marked price of the article will be?

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Let the marked price of item = ₹ N
∴ {(100  14) /100 } of N = 645Correct Option: C
Let the marked price of item = ₹ N
∴ {(100  14) /100 } of N = 645
⇒ N = (645 x 100)/86 = ₹ 750