Zahid buys an article for 20% less than its value and sells it for 20% more than its value. His gain or loss percentage is-

Question: Zahid buys an article for 20% less than its value and sells it for 20% more than its value. His gain or loss percentage is-

Solution:
Let, the value of an article is = x taka

Buying price = (x - 0.2x)
= 0.8x taka

Selling price = (x + 0.2x)
= 1.2x taka

Profit = (1.2x - 0.8x) = 0.4x taka

∴ Profit percentage = (0.4x/0.8x) × 100%
= (4/8) × 100%
= 50%