A shopkeeper expects a gain of 25% on his cost price. If in a week, his sale was of 800 Tk, what was his profit?

Question: A shopkeeper expects a gain of 25% on his cost price. If in a week, his sale was of 800 Tk, what was his profit?

Solution:
Given,
Selling price = 800 Tk.

For a gain of 25%,
The cost price can be = 125

∴ Cost price = {(100/125) × 800} Tk.
= (1000/125) × 800 Tk.
= 640 Tk

Therefore, Profit = (800 - 640) Tk.
= 160 Tk.