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2015-04-28T18:55:51+05:30

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Cost Price of 6 bananas = Rs 1
Selling price of 6 bananas = Rs 1 + 20 % of Rs 1 = Rs 1.20

if 6 bananas are sold at Rs 1.20, then cost of 5 bananas is Rs 1.

Hence,  he must sell 5 bananas for Rs 1 , to gain 20%

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