Question

the ratio of cost price and selling price of an article is 5:7. find the gain%?​

Answer 1

let cp us rs 5 ,sp is rs 7

profit and gain =sp-cp = 5-7 =2

gain percentage = gain * 100/cp = 2*100 /5= 40

gain is 40 %

Answer 2

cp=x

sp=7x/5

gain=sp-cp

gain=7x/5-x

gain=2x/5

gain%=gain/cp×100

2x/5/x×100

=2×100/5

40

∴gain%=40%