Question

If the cost prices of 100 notebooks are the same as the selling price of 80 notebooks. What is the gain per cent?
1. 15%
2. 30%
3. 25%
4. 20%

Answer 1

Correct Answer - Option 3 : 25%

Given:

CP × 100 = SP × 80

Formula:

Profit% = (SP - CP)/CP × 100

Calculation:

100 × CP = 80 × SP

⇒CP / SP = 80 /100

⇒CP/ SP = 4/5

⇒ Profit = SP - CP

⇒ Profit = 5 - 4

⇒ Profit = 1

Profit% = Sp-Cp/Cp × 100

⇒ Profit% = 1/4 × 100

⇒ Profit% = 25%

∴ The profit% is 25%