Option 2 : 25% loss

**Given:**

Cost price of 9 articles = Selling price of 12 articles

**Concept used:**

If cost price of 'a' articles is equal to the selling price of 'b' articles, then

Loss percentage = [(b - a)/b] × 100%, if (b > a)

**Calculation:**

Here, a = 9 and b = 12

Loss percentage = [(12 - 9)/12] × 100%

⇒ (1/4) × 100%

⇒ 25%

**∴ The loss percentage is 25%.**

Cost Price of 9 articles = Selling price of 12 articles

⇒ CP/SP = 12/9 = 4/3

Loss percentage = [(4 - 3)/4] × 100%

⇒ (1/4) × 100%

⇒ 25%

**∴ The loss percentage is 25%.**

If the cost price of 'a' articles is equal to the selling price of 'b' articles, then

Profit percentage = [(a - b)/b] × 100%, if (a > m)