Question
A man purchases some number of apples at the rate of 36
apple for Rs. 1. How many for a rupee did he sell to gain 12.5%.Solution
CP SP Price 100 unit 112.5 unit 8 : 9 
Quantity 9 : 8 36 apples 9 unit = 36 1 unit = 4 8 unit = 8 × 4 = 32 apples
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