Question

$\text{A vendor purchased bananas at Rs. 16 per dozen and sold them at 10 for Rs.18 . Find his gain or loss per cent.}$

Answer 1

$\text{C.P. Of 6 bananas, = Rs. 16}\therefore \text{and C.P. of 1 bananas}=Rs.\frac{16}{12}=Rs.\frac{4}{3}\text{S.P. of 10 bananas =Rs.18}\therefore \text{S.P of 1 banana =}Rs.\frac{18}{10}=Rs.\frac{9}{5}\text{Gain = S.P - C.P.=}Rs.\frac{9}{5}-Rs.\frac{4}{3}=\frac{27-20}{15}=Rs.\frac{7}{15}Gain\%=\frac{Gain\times 100}{C.P.}=\frac{\frac{7}{15}\times 100}{\frac{4}{3}}=\frac{7\times 100\times 3}{15\times 4}=35\%Ans.$