A bike owner buys petrol at ₹64, ₹80 and ₹320 per litre for three consecutive years. What is the average cost per litre of petrol if he spends ₹32000 each year?
Answer & explanation
Correct answer: option 4
Petrol consumption in 1st year = \(\frac{32000}{64}\) = 500 litres
Petrol consumption in 2nd year = \(\frac{32000}{80 }\) = 400 litres
Petrol consumption in 3rd year = \(\frac{32000}{320}\) = 100 litres
Total petrol consumption in 3 years = 500 + 400 + 100 = 1000 litres
Average cost = \(\frac{3 × 32000 }{1000}\) = Rs96