When a plot is sold for Rs. 18700, the owner loses 15% . At what price must the plot be sold in order to gain 15% ?

Answer: Option C

Let the new S.P. be Rs. x
Then, 85 : 18700 = 115 : x
$$\begin{array}{rl}& \Rightarrow x=\left(\frac{18700\times 115}{85}\right)\\ & \Rightarrow x=25300\end{array}$$