Correct Answer - Option 2 : 20%

**Given-**

Selling price of 15 articles = cost price of 12 articles

**Formula Used-**

Loss% = (CP - SP)/CP × 100 [where CP = Cost Price and SP = Selling Price]

**Calculation-**

Let selling price of each article = x

According to Question-

15x = 12 CP [where CP = Cost Price of each article]

⇒ CP = 15x/12

Loss% = (15x/12 - x)/(15x/12) × 100

⇒ (x/4)/(5x/4) × 100

⇒ 1/5 × 100

⇒ 20%

∴ The loss% in whole transaction is 20%