Correct Answer - Option 1 : 33.33% profit

**Formula used:**

Profit = SP - CP

Profit % = (Profit/CP) × 100

Here, SP → Selling price, CP → Cost price

**Calculation:**

A man buys 10 pens for Rs.15

Cost of 1 pen = 15/10 = Rs. 1.5

Selling price of 1 pen = Rs. 2

Profit = SP - CP = 2 - 1.5 = Rs. 0.5

Profit % = (Profit/CP) × 100

⇒ (0.5/1.5) × 100 = 33.33%

**∴ The profit percent is 33.33%**