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

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

a.7.98

b.7.09

c.7.99

d.7.88

Asked By : Hari Categories : Aptitude, Technical, IBM

Answer: 7.89

Answers

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petrol used in 1st yr = 4000/7.5 = 533.33 ltr
petrol used in 2nd yr = 4000/8 = 500 ltr
petrol used in 3 rd year = 4000/8.5= 470.59 ltr

Total petrol used for Rs. 12000 in 3 yrs = 1503.92 ltr

Average cost per litre = 12000/1503.92 = Rs. 7.98

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