a man bought bananas at the rate of rs.20 per dozen and sold them at th rate of 10 for rs 25. find his gain or loss per cent.

CP of 12 bananas = Rs. 20

CP of 1 banana = Rs. 20/12

Total bananas bought = 12*10= 120

CP of 120 bananas =

SP of 10bananas= Rs. 25

SP of 1 banana = Rs. 25/10

SP of 120bananas =

Now, SP > CP, then it is a gain.

Profit = SP - CP = Rs. (300-200) = Rs.100

Therefore,

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