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