A box is bought of Rs. 75 and sold at a gain of 8%. Find its selling price = ?

Answer: Option A

Cost price of box = Rs. 75
gain% = 8%
Now, required selling price
$$\begin{array}{rl}& =\left(108\%\text{ of Rs}\text{.75}\right)\\ & =\text{Rs}\text{.}\left(\frac{75\times 108}{100}\right)\\ & =\text{Rs}\text{.81}\end{array}$$