Question

With method if the cost price of 15 pens is equal to the selling price of 20 then the loss percentage is

Answer 1

Let CP of 15 pens=SP of 20 pens be x

CP of one pen=x/15

SP of one pen=x/20

CP>SP so it is loss

Loss=CP-SP

Loss=(x/15)-(x/20)

Loss=x/60

Loss percentage=(Loss/CP)*100

                           =(15/60)*100

                           =(1/4)*100

                           =25%