Correct Answer - Option 3 : 10% loss

**Given- **

Initially SP = Rs 770

Final SP = 630

**Concept Used-**

Profit% = (SP - CP)/CP × 100 [where CP = Cost Price and SP = Selling Price]

Loss% = (CP - SP)/CP × 100 [where CP = Cost Price and SP = Selling Price]

**Calculation-**

Gain = 1/10 × 100

⇒ 10%

According to Question-

CP(1 + 10%) = 770

⇒ CP = 700

Now Loss% on selling the article at Rs 630 = (700 - 630)/700 × 100

⇒ 7/70 × 100

⇒ 10%

∴ His loss% would have been 10%.