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Q1
:
A car owner buys petrol at Rs.7.50, Rs. 8 and Rs. 8.50 per litre for three successive years. What approximately is the average cost per litre of petrol if he spends Rs. 4000 each year?
A
Rs. 8
B
Rs. 8.50
C
Rs. 9
D
Rs. 7.98
Solution
ANS:
A
- Rs. 7.98
Total quantity of petrol
consumed in 3 years
=
4000
+
4000
+
4000
litres
7.50
8
8.50
= 4000
2
+
1
+
2
litres
15
8
17
=
76700
litres
51
Total amount spent = Rs. (3 x 4000) = Rs. 12000.
Average cost = Rs.
12000 x 51
= Rs.
6120
= Rs. 7.98
76700
767
Share :
Average cost = Rs.