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 ?
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Total amount of petrol
4000/7.5+4000/8+4000/8.5
=4000/7.5+4000/8+4000/8.5
Total cost equals Rs 12000
Average cost=12000/ (Total quantity) =12000/ ((4000/7.5) + (4000/8) + (4000/8.5))
= 7.98 Rs
The whole concept of calculating the prorate amount is to calculate the total amount spent over 3 years.
After evaluating the amount, one should also calculate the total quantity of the petrol. Diving both values gives the correct results.
4000/7.5+4000/8+4000/8.5
=4000/7.5+4000/8+4000/8.5
Total cost equals Rs 12000
Average cost=12000/ (Total quantity) =12000/ ((4000/7.5) + (4000/8) + (4000/8.5))
= 7.98 Rs
The whole concept of calculating the prorate amount is to calculate the total amount spent over 3 years.
After evaluating the amount, one should also calculate the total quantity of the petrol. Diving both values gives the correct results.
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