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Question

A car owner buys petrol at Rs. 7.50, Rs. 8.00 and Rs. 8.50 per litter for 3 successive years. If he spends Rs. 4000 each year , then the average cost per litter of petrol is

A
Rs. 8
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B
Rs.8.25
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C
Rs. 7.98
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D
none of these
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Solution

The correct option is C Rs. 7.98
Given,

Qty of petrol used first year=40007.5=533.333Ltrs.

Petrol used second year=40008=500Ltrs.

And in 3rd year=40008.5=470.588Ltrs.

Hence total Qty of petrol consumed in 3 years=533.333+500+470.588=1503.92Ltrs.

And money spent in 3years =4000×3=12000RS.

Hence average cost of per Ltr petrol=120001503.92=7.98

Answer is 7.98 RS per Ltrs.

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