Correct Answer - Option 3 : Rs. 2400

**Given:**

Marked price = Rs. 3200

Discount % = 15%

Profit% = 13.33% = (40/3)%

**Formula used:**

CP/MP = (100 - Discount %)/(100 + Profit%)

**Calculation:**

∵ CP/MP = (100 - Discount %)/(100 + Profit%)

⇒ CP/3200 = (100 - 15)/(100 + 40/3)

⇒ CP/3200 = 85/[(300 + 40)/3]

⇒ CP/3200 = (85 × 3)/340

⇒ CP = (85 × 3 × 3200)/340

⇒ CP = Rs. 2400

**∴ The cost price of an article is Rs. 2400.**