Correct Answer - Option 5 : 50%

**Given:**

The sweet seller sells sweets at 20% profit

**Formula used:**

Profit or Gain % = {(Selling price – Cost price)/Cost price} × 100

**Calculation:**

Let Cost price of 1 kg = Rs. 1000

The selling price of 800 gm at 20% profit = {1000(100 + 20)}/100

The selling price of 800 gm = Rs. 1200

Cost price of 800 gm = Rs. 800

Profit or Gain % = {(1200 – 800)/800} × 100

⇒ (400/800) × 100

⇒ 50%

**∴ The profit percentage of the sweet seller is 50%.**