Ravi buys some toffees at 2 for a rupee and sells them at 5 for a rupee. His loss percent is = ?

Answer: Option D

Let the number of toffees bought be (2 x 5) = 10
C.P. of 10 toffees $$=\text{Rs}\text{.}\left(\frac{1}{2}\times 10\right)=\text{Rs}\text{.}5$$
S.P. of 10 toffees $$=\text{Rs}\text{.}\left(\frac{1}{5}\times 10\right)=\text{Rs}\text{.}2$$
$$\begin{array}{rl}& \text{Loss}\%=\left(\frac{3}{5}\times 100\right)\%\\ & =60\%\end{array}$$