Correct Answer - Option 2 : 75%

**Given:**

Average sales = 27 per week increased

Old sales = 16 per week

**Calculation:**

The average rate of percentage increase in both the cases- weekly and yearly will be the same.

⇒ Annual percentage in sales = (28-16) × 100/16

⇒ 75%

**∴ annual percentage increase is 75%**