My Math Forum why 9CP is written?

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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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