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Question

A car owner buys petrol at Rs.7.50,Rs.8 and 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.7.98
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B
Rs.8
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C
Rs.8.50
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D
Rs.9
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Solution

The correct option is A Rs.7.98
Total quantity of petrol consumed in 3 years =(40007.50+40008+40008.50)litres
=4000(215+18+217)litres
=(7670051)litres
Total amount spent =Rs.(3×4000)=Rs.12000.
Average cost =Rs.(12000×5176700)=Rs.6120767=Rs.7.98

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