Aptitude - Compound Interest - Discussion
Discussion Forum : Compound Interest - General Questions (Q.No. 15)
15.
The compound interest on a certain sum for 2 years at 10% per annum is Rs. 525. The simple interest on the same sum for double the time at half the rate percent per annum is:
Answer: Option
Explanation:
Let the sum be Rs. P.
| Then, |  |
P |  |
1 + | 10 |  |
2 | - P |  |
= 525 |
| 100 |
 |
P | |
|
11 | |
2 | - 1 | |
= 525 |
| 10 |
| P = |
|
525 x 100 | |
= 2500. |
| 21 |
Sum = Rs . 2500.
| So, S.I. = Rs. | |
2500 x 5 x 4 | |
= Rs. 500 |
| 100 |
Discussion:
37 comments Page 4 of 4.
Sikun said:
1 decade ago
CI=Amount-Principle.
And we know the CI, but don't know Principle. So to find P we are subtracting P.
And we know the CI, but don't know Principle. So to find P we are subtracting P.
Balu said:
1 decade ago
I am not getting why they have taken -p? can any one explain pls..?
Hemant said:
1 decade ago
I am confused that why we are taking -p. Can you explain me ?
Vidhur said:
1 decade ago
@sandy
Given that 525 is the CI calculated for 2 years at a rate of 10%. so, 525 is the difference of ((P+CI)-(p)). where "p" is the principle amount.
Did you get sandy?
Given that 525 is the CI calculated for 2 years at a rate of 10%. so, 525 is the difference of ((P+CI)-(p)). where "p" is the principle amount.
Did you get sandy?
Sandy said:
1 decade ago
Can anyone elaborate why there is a -P ? I'm unable to understand. !
(1)
Vibhanshu said:
1 decade ago
Actually 525/21=25
123 said:
1 decade ago
P = 525 x 100 = 2500.
21 ?
21 ?
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