Option 2 : 100%

**Given:**

Rate, R = 50%

**Concept used:**

If the price of commodity decreases by R%, then the increase in consumption, so as not to decrease the expenditure is [{R/(100 - R)} × 100]%

**Calculation:**

As we know that,

Increase in consumption = [{R/(100 - R)} × 100]%

⇒ [{50/(100 - 50)} × 100]%

⇒ [(50/50) × 100]%

⇒ 100%

**∴ The percentage increase in consumption is 100%.**

__Important Points__

If the price of commodity increases by R%, then the reduction in consumption, so as not to increase the expenditure is [{R/(100 + R)} × 100]%