For three successive years the cost of petrol were Rs 20 per litre Rs 22 per litre and Rs 23 50 per ...........

Quantitative Aptitude ( CCS) Average

For three successive years, the cost of petrol were Rs 20 per litre, Rs 22 per litre and Rs 23.50 per litre respectively. If a man spent an average of Rs 8000 per year on petrol, then he spent what average cost of petrol per litre for the three years?

Rs 20

Rs 25.3

Rs 28.2

Rs 21.7

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Explanation:

Quantity used in 1st yr = 8000/20 = 400 l, in 2nd yr = 8000/22 = 363.6, in 3rd yr = 340.4 l
Total used in 3 yrs = 1104 litres, total money spent in 3 yrs = 3*8000 = 24000
So average rate of 3 yrs = 24000/1104 = 21.7