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 9 of 10.
Ravi said:
1 decade ago
Thanks krishna.
Bhupesh said:
1 decade ago
I cant understand last calculation that why the reciprocal of the cosumed quatity of the petrol is taken?
Jasmine said:
1 decade ago
Tanks krish. !
Iswarya said:
1 decade ago
Hey thank you krishna that was usful.
M.v.krishna said:
1 decade ago
c.p of lit petrol in 1st yr = Rs.7.50
amt spend on petrol = Rs.4000
petrol quantity in 1st yr = (4000/7.50) = 533.33
c.p of lit petrol in 2nd yr = Rs.8.00
amt spend on petrol = Rs.4000
petrol quantity in 2nd yr = (4000/8.00) = 500.00
c.p of lit petrol in 3rd yr = Rs.8.50
amt spend on petrol = Rs.4000
petrol quantity in 3rd yr = (4000/8.50) = 470.58
total quantity of petrol used in 3yrs = 1503.91
total amount spent on petrol = 3*4000 = 12000
so, avg cost of liter petrol = (12000/1503.91)
=7.9
amt spend on petrol = Rs.4000
petrol quantity in 1st yr = (4000/7.50) = 533.33
c.p of lit petrol in 2nd yr = Rs.8.00
amt spend on petrol = Rs.4000
petrol quantity in 2nd yr = (4000/8.00) = 500.00
c.p of lit petrol in 3rd yr = Rs.8.50
amt spend on petrol = Rs.4000
petrol quantity in 3rd yr = (4000/8.50) = 470.58
total quantity of petrol used in 3yrs = 1503.91
total amount spent on petrol = 3*4000 = 12000
so, avg cost of liter petrol = (12000/1503.91)
=7.9
(5)
Shivapriya said:
1 decade ago
Can anyone explain clearly ?
Prince said:
1 decade ago
It is not clear very much......
Muralidhar reddy said:
1 decade ago
Here how average cost calculated any explain me ?
SriHarsha said:
1 decade ago
Can any 1 xplain it clearly wit simpl logic.
Jeevankumar said:
1 decade ago
Explain answer in simple logic.
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