- 25%
- 20%
- 16%
- 18%

Option 2 : 20%

**Given:**

The cost price of 66 Laptop is equal to the selling price of 55 Laptop

**Formula Used:**

Profit % = {(SP – CP)/CP} × 100

**Calculation:**

Let the CP of 1 Laptop = Rs. 1

CP of 55 Laptop = Rs.. 55

CP of 66 Laptop = Rs. 66

SP of 55 Laptop = CP of 66 Laptop = Rs. 66

Gain percent = [(66 – 55)/55] × 100 = 20%

**∴ Gain percent is 20%**

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