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July 1st, 2018, 09:18 PM  #1 
Senior Member Joined: Aug 2014 From: India Posts: 343 Thanks: 1  why 9CP is written?
The profit that a person makes on selling 9 apples is equal to the cost of 2 apples. What is the percentage of profit? Solution: 9*SP  9*CP = 2*CP 9*SP = 11*CP SP/CP = 11/9 Profit% = 2/9 = 22.22% Question didn't mentioned about 9CP. so why 9CP is written? 
July 1st, 2018, 10:45 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,285 Thanks: 1967 
The question mentioned "profit", which (per apple) is SP  CP. The profit on selling 9 apples is therefore 9(SP  CP) = 9SP  9CP. 

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