JOHN used to buy petrol at the rate of Rs. 80 per LITER TILL last month.Now he BUYS it at the rate of Rs. 85 per liter.Increase in percentage = (85 – 80)/ 80 × 100= 5/ 80 × 100= 0. 0625 × 100 = 6.25Hence, “6.25 %” is the correct answer.