A man put diesel at Rs.7.50, Rs. 8 and Rs. 8.50 per ltr for three successive years. What approximately is the average cost per ltr of diesel if he spends Rs. 4000 each year? Choose one.
A) Rs. 7.98 B) Rs. 8.45 C) Rs. 8.98 D) Rs. 9.23 E) Rs. 9.86
Total quantity of diesel   consumed in 3 years   = 4000	+	4000	+	4000 litres   7.50	8	8.50   = 4000 2	+	1	+	2	ltr   15	8	17   = 76700	ltr   51   Total amount spent = Rs. (3 x 4000) = Rs. 12000.   Average cost = Rs. 12000 x 51 = Rs.	6120 = Rs. 7.98   76700	767   Rs. 7.98
<result>A</result>
A man put diesel at Rs.7.50, Rs. 8 and Rs. 8.50 per ltr for three successive years. What approximately is the average cost per ltr of diesel if he spends Rs. 4000 each year?