Question

The selling price of a book is 7/5

times its cost price, find the gain percent.​

Answer 1

sp =7/5cp

gain is. sp-cp/100

(7/5-1)×100

2/5×100

40%

Answer 2

Step-by-step explanation:

let c.p. of book = x

then s. p. of book = 7x/5

gain = s. p. - c. p.

gain = 7x/5 - x

= (7x-5x) /5

gain = 2x/5

gain % = gain x 100/ c. p.

$gain \: percent = \frac{2x}{5} \times 100 \div x \\ = \frac{200x}{5} \times \frac{1}{x} \\ = \frac{200}{5} \\ = 40$