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

$cp \: of \: one \: banana = \frac{1}{15} \\ sp \: of \: one \: banana = \frac{1}{9} \\ gain = sp - cp \: = \frac{1}{9} - \frac{1}{15} = \frac{2}{45} \\ gain\% = \frac{gain}{cp} \times 100 \\ = \frac{ \frac{2}{45} }{ \frac{1}{15} } \times 100 = \frac{200}{3} \\ = 66 \frac{2}{3} \%$