The price of petrol rises from ₹ 70/lit to ₹ 80/lit. If the expenditure cannot increase, then the percentage of reduction in consumption is-10%15.5%12.5%14.2%

The problem is asking for the percentage reduction in consumption due to the increase in price.

Here are the steps to solve this problem:

1. First, find the percentage increase in the price of petrol. The price increased from ₹70 to ₹80, so the increase is ₹10.

2. To find the percentage increase, divide the increase by the original price and multiply by 100. So, (10/70)*100 = 14.28%. This is the percentage increase in price.

3. Since the expenditure cannot increase, the percentage reduction in consumption must be equal to the percentage increase in price.

So, the percentage of reduction in consumption is 14.28%.

Therefore, the closest answer is 14.2%.