Question

by selling 36 bananas a vendor loses the selling price of 4 bananas find his loss percent

Answer 1

Loss= Cost price - selling price = 4
Loss%= 4/100
=1/25

Answer 2

We know 
cost amount-loss amount=4
36-l.a=4
l.A=32
now loss%=100-32/36x100
                   =100-3200/36=100-88.8
                    =11.2%