Question

A computer costs Rs 39600. In the last 6 months, the price had come down by 12%. What was the price of the computer 6 months back?

Answer 1

Present cost of Computer = Rs.39600
Suppose the cost of computer 6 months back was Rs.x.
And according to the question, in the last 6 months, the price had come down by 12%.
So present cost of computer = $x-x\times \frac{12}{100}=\mathrm{Rs}.39600$
$$\begin{gathered} \Rightarrow x-\frac{3x}{25}=39600 \\ \Rightarrow \frac{22x}{25}=39600 \\ \Rightarrow x=\frac{39600\times 25}{22}=45000 \end{gathered}$$
Therefore cost of computer 6 months back was Rs.45000.