Kalam 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 list price?

Question: Kalam 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 list price?

Solution:
Let, the original price is 100 taka
Buying price = 100 - 25
= 75 taka

To make 25% over original price = 100 + 25
= 125 taka

percentage above the cost price = {(125 - 75)/75} × 100%
= (50/75) × 100%
= (2/3) × 100%
= 66.67%