Question

$\text{If the selling price of 16 water bottles is equal to the cost price of 17 water bottles, find the gain per cent earned by the dealer.}$

Answer 1

$\text{Let C.P. of 17 water bottles = Rs. 17}\text{Then C.P of one bottle}Rs.\frac{17}{17}=Re.1\text{and S.P. of 16 bottles = Rs.17}\text{then S.P, of 1 bottle}=Rs.\frac{17}{16}\text{gain = S.P - C.P.}=\frac{17}{16}-\frac{1}{1}=Rs.\frac{1}{16}\text{gain}\%=\frac{gain\times 100}{C.P}=\frac{\frac{1}{16}\times 100}{1}=\frac{100}{16}=6\frac{1}{4}\%Ans.$