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:
92 comments Page 4 of 10.
Shivani Sharma said:
6 years ago
Thanks @Krishna.
Nitin said:
1 decade ago
Thnks krishna your result is so easy.
Karthik said:
5 years ago
You are correct, Thanks @Krishna.
Shanmukh Adari said:
7 years ago
It was so useful, thanks for the answer @M.V.Krishna.
Aman said:
7 years ago
1st-year cost of petrol=7.50.
2nd-year cost of petrol=8.
3rd-year cost of petrol=8.50.
The spend amounts each year=4000.
1st-year the quantity of petrol used =4000/7.50=533.33,
2nd yr = 4000/8=500,
3rd yr=4000/8.50=503.33,
total amount spend = 4000 * 3/quantity of petrol use.
12000/1536.66 = 7.9.
2nd-year cost of petrol=8.
3rd-year cost of petrol=8.50.
The spend amounts each year=4000.
1st-year the quantity of petrol used =4000/7.50=533.33,
2nd yr = 4000/8=500,
3rd yr=4000/8.50=503.33,
total amount spend = 4000 * 3/quantity of petrol use.
12000/1536.66 = 7.9.
Lavina said:
7 years ago
Nice one, it's really helpful, thanks @M. V. Krishna.
Subai said:
7 years ago
Thanks, really useful.
Sharja said:
7 years ago
Yes, right @Mass.
Mass said:
7 years ago
Here, the Question should be what is the average cost he spent per litre of petrol if he spends 4000 each year? Not the average cost of petrol?
Mahadeb said:
8 years ago
Thanks for the explanation.
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