Rohan buys an article at a discount of 25%. At what percentage above the cost price should he sell it to make a profit of 25% over the original price?

He must sell at 66.67% above cost price.

Take original price = 100; a 25% discount makes his cost 75.

A 25% profit on the original price means selling at 125.

Gain over cost = 125 - 75 = 50.

50/75 x 100 = 66.67%.