a) Rs. 7.98
b) Rs. 8
c) Rs. 8.50
d) Rs. 9
Answer: a
Explanation: Total quantity of petrol consumed in 3 years
$$\eqalign{
& = \left( {\frac{{4000}}{{7.50}} + \frac{{4000}}{8} + \frac{{4000}}{{8.50}}} \right){\text{litres}} \cr
& = 4000\left( {\frac{2}{{15}} + \frac{1}{8} + \frac{2}{{17}}} \right){\text{litres}} \cr
& = {\frac{{76700}}{{51}}} {\text{ litres}} \cr
& {\text{Total}}\,{\text{amount}}\,{\text{spent}} = Rs.\,\left( {3 \times 4000} \right) \cr
& = Rs.\,12000 \cr
& {\text{Average}}\,{\text{Cost}} = Rs.\, {\frac{{12000 \times 51}}{{76700}}} \cr
& = Rs.\,\frac{{6120}}{{767}} \cr
& = Rs.\,7.98 \cr} $$
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