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A Dishonest sweet seller sells sweets at 20% profit but uses 800 gm instead of 1 kg. Find his profit percentage?
1. 40% 
2. 45%
3. 25%
4. 60%
5. 50%

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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%.

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