A person first increases the price of a commodity by 10% and then he announces a discount of 15%. The actual discount on the original price is -

Answer: Option B

Let the original price of the commodity be Rs. 100.
Increased price = Rs. 110
Price after discount
$$\begin{array}{rl}& =\text{85}\%\text{ of Rs}\text{.110}\\ & \text{ = Rs}\text{.}\left(\frac{85}{100}\times 110\right)\\ & =\text{Rs}\text{. 93}\text{.50}\end{array}$$
∴ Discount on original price = (100 - 93.50)% = 6.5%