Aptitude - Average - Discussion
Discussion Forum : Average - General Questions (Q.No. 9)
9.
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?
Answer: Option
Explanation:
| Total quantity of petrol consumed in 3 years |
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Total amount spent = Rs. (3 x 4000) = Rs. 12000.
 Average cost = Rs. |
 |
12000 x 51 |  |
= Rs. | 6120 | = Rs. 7.98 |
| 76700 | 767 |
Discussion:
93 comments Page 10 of 10.
Saimadhav Thottala said:
3 years ago
1st year = 4000/7.5 = 533.33 litres,
2nd year = 4000/8 = 500 litres,
3rd year = 4000/8.5 = 470.58 litres.
Total Petrol in 3 years = 1503.91 litres
Total amount invested in 3 year = 4000 * 3 = 12000,
Average cost of petrol per litre = 12000/1503.91 = 7.98 Rs.
2nd year = 4000/8 = 500 litres,
3rd year = 4000/8.5 = 470.58 litres.
Total Petrol in 3 years = 1503.91 litres
Total amount invested in 3 year = 4000 * 3 = 12000,
Average cost of petrol per litre = 12000/1503.91 = 7.98 Rs.
(215)
Swetha S said:
1 year ago
Average cost = 7.50/3 + 8/3 + 8.50/3.
Average cost = 2.50 + 2.66 + 2.83 = 7.99.
Average cost = 2.50 + 2.66 + 2.83 = 7.99.
(121)
Riya said:
5 days ago
The three years he spent the same amount of money on different quantities of petrol.
1st year.
4000/7.50 = 533.3333.
2nd year
4000/8 = 500.
3rd year
4000/8.5 = 470.588.
The total litres of petrol are:533.3333 + 500 + 470.588235 = 1503.93
Spend money over 3 years: 4000 + 4000 + 4000 = 12000.
Average cost of petrol = 12000/1503.93 = 7.97.
1st year.
4000/7.50 = 533.3333.
2nd year
4000/8 = 500.
3rd year
4000/8.5 = 470.588.
The total litres of petrol are:533.3333 + 500 + 470.588235 = 1503.93
Spend money over 3 years: 4000 + 4000 + 4000 = 12000.
Average cost of petrol = 12000/1503.93 = 7.97.
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