Question

On selling a boat for 521 a main gain 8percent for how much should he sell it to gain9 percent.

Answer 1

let cot price = 100%
then first selling price will be 108%
so 108% = 521
then final gain = 9% means 109% selling price
so 109% = (521/108)×109 = 525.81
he should sell at rs 525.81

Answer 2

let he should sell it for Rs. "x "

according to question,

108 % = 521

109 % = x

by cross multiplication, we get,

108 x= 521 × 109

108 x = 56789

x = 56789 / 108

x = 525.82
hence he must sell it for Rs.525.82 to gain 9%.