Question

The selling price of 20 pens is equal to cost price of 15pens

The loss or gain percent of pens
i) 21
ii) 25
iii) 23
iv) none

Answer 1

CP of 15 pen=SP Of 20 pen. Let the SP of 1 pen be Rs1. So CP of 15 pen =Rs 20

CP of 1 pen = (20/15) =4/3=1.33

loss=(cp—sp) /cp = (1.33–1)/1.33=0.25

Loss%=0.25*100=25%

Hope it help you, happy learning