A car owner buys petrol at Rs 7 50 Rs 8 and Rs 8 50 per litre for three successive years What approx...........

Quant (SSC) Average

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?

7.98

8.25

6.24

5.98

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Explanation:

Total quantity of petrol consumed in 3 years =(4000/7.50+4000/8+4000/8.50) liters
=4000(2/15+1/8+2/17) liters
=76700/51 liters
Total amount spent = Rs. (3 x 4000) = Rs. 12000.
Average cost = Rs. (12000*51/76700) = Rs. 7.98.

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