Mahesh marks an article 15% above the cost price of Rs. 540. What must be his discount percentage if he sells it at Rs. 460?  Choose the correct choice from the following answers:
A) 18 %  B) 21 %  C) 25.9 %  D) 19 %  E) none of these

Rationale: cp = rs . 540 , mp = 540 + 15 % of 540 = rs . 621 sp = rs . 460 , discount = 621 - 460 = 161 discount % = 161 / 621 * 100 = 25.9 % answer : c
Answer: C