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June 29th, 2018, 05:21 AM  #1 
Senior Member Joined: Aug 2014 From: India Posts: 343 Thanks: 1  Why we need to calculate two extra SP's i.e 120 and 7680 ?
A shopkeeper sells an article at a discount of 25% on the Marked price and makes a profit of 20% If the selling price of the article is Rs 7200, then how much discount should he offer on the marked price to make a profit of 28%? Solution: Let cp=100, sp=120 then mp=160 1207200 160 cp=6000 sp=7200 mp=9600 New sp=60*128=7680 DISCOUNT =96007680=1920 My doubts: Why we need to derive two extra SP's i.e 120 and 7680 for this problem ? How MP = 9600 is obtained? Last edited by skipjack; June 29th, 2018 at 07:45 AM. 
June 29th, 2018, 07:38 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,285 Thanks: 1968 
As the Rs 7200 price = MP(1  25/100), MP = Rs 7200(1  25/100) = Rs 9600. For a 28% profit, SP = Rs 7200(1 + 28/100)/(1 + 20/100) = Rs 7680, so the discount is now Rs (9600  7680) = Rs 1920, which is 20% of the MP. 

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