The marked price is 10% higher than the cost price. A discount of 10% is given on the marked price. In this kind of sale, the seller = ?

Answer: Option D

Let the cost price of article be Rs. 100
∴ Marked price = Rs. 110
Discount % on marked price = 10%
$$\begin{array}{rl}& \text{Selling price}\\ & =\frac{110\times 90}{100}\\ & =Rs.99i.e.,1\%loss\end{array}$$