A man bought an old typewriter for Rs. 1200 and spent Rs. 200 on its repair. He sold it for Rs. 1680. His profit percent is = ?

Answer: Option A

According to the question,
Cost price = 1200
Repair = 200
Total Cost price = Rs. 1400
Selling price = Rs. 1680
Profit = 280
$$\begin{array}{rl}& \text{Profit }\%=\frac{280}{1400}\times 100\\ & =20\%\end{array}$$