
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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August 1st, 2019, 11:58 PM  #1 
Senior Member Joined: Aug 2014 From: India Posts: 458 Thanks: 1  why second case MP taken as 100?
A shop's prices are 25% above C.P, but it allows its customer 12% on the amount of their bills. What is the profit percent made? Sol: MP/CP = 125/100 = 5/4  1 SP/MP = 88/100 i.e. 22/25  2 multiply 1 and 2 SP/CP = 5/4*22/25 = 11/10 I.e 10% PROFIT. In first case, MP is taken as 125, but in second case, MP taken as 100. Why second case MP taken as 100 not 125? Last edited by skipjack; August 2nd, 2019 at 06:20 AM. 
August 2nd, 2019, 06:33 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,921 Thanks: 2203 
The solution uses 100 in the denominator because "%" means "divided by 100". The "100" will correspond to whatever the percentage is being applied to, which is the cost price for equation 1, but the marked price for equation 2. The solution uses 125 in the numerator because the marked prices are 125% of the corresponding cost prices. In equation 2, the selling price is 88% of the marked price. 

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