Mohan bought an article at 20% less of the marked price and sold it at 20% more than the marked price. Find the profit earned by him.

Question: Mohan bought an article at 20% less of the marked price and sold it at 20% more than the marked price. Find the profit earned by him.

Solution:
Let the marked price be Tk. 100
∴ Cost Price = 100 - 20 = 80
And,
Selling Price = 100 + 20 = 120

Profit = 120 - 80 = 40

Profit % = (40/80) × 100% = 50%