Question

a men sells 320 mangoes at the cost price of 400 mangoes his gain percentage

Answer 1

let CP of 1 mango be rs.1
SP of 320 mangoes=CP of 400 mangoes=400
CP of 320 mangoes=320
gain=400-320=80
gain%=80/320*100
=25%
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Answer 2

gain percent is 25%.
Hope it helps you.