Correct Answer - Option 4 : 21%

**Formula used:**

Profit = SP – CP

Profit % = Profit/CP × 100

Here, CP and SP are cost price and selling price respectively

**Calculation:**

CP of 11 m cloth = 100

CP of 1 m cloth = 100/11

And, SP of 10 m cloth = 110

SP of 1 m cloth = 110/10 = 11

Profit = SP of 1 m cloth – CP of 1 m cloth

⇒ 11 – 100/11

⇒ (121 – 100)/11

⇒ 21/11

Profit % = [(21/11)/(100/11)] × 100

⇒ 21%

**∴ The profit percentage is 21%**