Correct Answer - Option 1 : 10%

**Given:**

Cost of old bicycle = Rs. 1500

Spends on repair of bicycle = Rs. 500

Selling price of old bicycle = Rs. 1800

**Formula used:**

Loss% = Loss/CP × 100

**Calculation:**

CP of old bicycle = (1500 + 500) = Rs. 2000

SP of old bicycle = Rs. 1800

Loss = Rs. (2000 – 1800)

⇒ 200

Loss% = 200/2000 × 100

⇒ 10%

**∴ The percentage of his loss is 10%**