Question

On selling a calculator for Rs 1325, a man gains 6%. For how much should he sell it to gain 12%?

Answer 1

SP of the calculator = Rs. 1325
Gain % = 6

CP of the calculator = $\{\frac{100}{(100+\mathrm{Gain}\%)}\times \mathrm{SP}\}$

$$\begin{gathered} =\{\frac{100}{(100+6)}\times 1325\} \\ =\frac{132500}{106} \\ =\mathrm{Rs}.1250 \end{gathered}$$

$$\begin{gathered} \mathrm{SP}\mathrm{of}\mathrm{the}\mathrm{calculator}=\{\frac{(100+\mathrm{Gain}\%)}{100}\times \mathrm{CP}\} \\ =\{\frac{(100+12)}{100}\times 1250\} \\ =\frac{140000}{100} \\ =\mathrm{Rs}.1400 \end{gathered}$$