Question

Bananas are bought at 15 for a rupee and sold at the rate of 9 for a rupee. The gain percent is

Answer 1

Cp of $15$ bananas $=1$ Rs.

Cp of $1$ banana $=\frac{1}{15}$ Rs.

Sp of $9$ bananas $=1$Rs

Sp of $1$ banana $=\frac{1}{9}$Rs.

Gain $\%=\frac{\frac{1}{9}-\frac{1}{15}}{\frac{1}{15}}\times 100$

$=\frac{6\times 15}{9\times 15}\times 100$

$=66.67\%$.