A car owner buys petrol at Rs 7 50 Rs 8 Rs 8 50 per litre for three consecutive years What approxima...........

Quantitative Aptitude ( CCS) Average

A car owner buys petrol at Rs.7.50, Rs.8, Rs.8.50 per litre for three consecutive years. What approximately is the average cost per litre if he spends Rs.4000 each year?

Rs6.35

Rs5.85

Rs7.98

Rs6.75

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Explanation:

Solution:
Total quantity of petrol purchased
=4000/7.5+4000/8+4000/8.5
Total cost =4000*3
Average=(4000*3) /(4000/7.5+4000/8+4000/8.5)
=3/(1/7.5+1/8+1/8.5)
=Rs7.98.