10. Toffees are bought at the rate of 7 for a rupee and sold at the rate of 5 for a rupee. Find the gain per cent.
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If 7 toffees are bought for Re.1, the CP (cost price) of each toffee is Re.1/7.
If 5 toffees are sol for Re.1, the SP (selling price) of each toffee is Re.1/5.
The gain is Re.(1/5) - (1/7) or Re. 2/35 and the gain percent is (2/35)*100/(1/7)
= (2*7/35*1)*100 = 1400/35 = 40%.
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