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Average

Q1:

A car owner buys petrol at Rs.7.50, Rs. 8 and Rs. 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

B Rs. 8

C Rs. 8.50

D Rs. 9

ANS:A - Rs. 7.98

Total quantity of petrol
consumed in 3 years
= 4000 + 4000 + 4000  litres
7.50 8 8.50
 
= 4000 2 + 1 + 2  litres
15 8 17
 
= 76700  litres
51
Total amount spent = Rs. (3 x 4000) = Rs. 12000.
 Average cost = Rs. 12000 x 51 = Rs. 6120   = Rs. 7.98
76700 767



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