For three years, a car owner buys gas at Rs.7.50, Rs. 8, and Rs. 8.50 per litre. If he spends Rs. 4000 per year on gasoline, what is the average cost per litre?
A. Rs. 7.98
B. Rs. 8
C. Rs. 8.50
D. Rs. 9
Answer:A
For three years, a car owner buys gas at Rs.7.50, Rs. 8, and Rs. 8.50 per litre. If he spends Rs. 4000 per year on gasoline, what is the average cost per litre?
A. Rs. 7.98 B. Rs. 8 C. Rs. 8.50 D. Rs. 9
Explanation: Total amount of petrol consumed over three years = 4000/7.50 + 4000/8 + 4000/8.50 litres= 4000 litres 2/15 + 1/8 + 2/17= 76700 litres/51 litre,Total amount spent = Rs. (12000) (3 x 4000).Rs. 12000 multiplied by 51/76700 equals Rs. 6120/767 = Rs. 7.98