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.
Kiran said:
9 years ago
Can anyone tell the simple form to get the value of p?
Tshering choden said:
9 years ago
Why did we subtract -1 in place of - p? I can't get this step, help me.
Chetana said:
9 years ago
Because they took p to be common @Tshering.
R.b said:
9 years ago
Thank you, P.Kumar. Very well explained.
Sanjeev Sharma said:
9 years ago
We can always take base as 100.
On 100 CI for 2 yrs @10% = 21,
Now since CI is 525, therefore, P = 100 ÷ 21 * 525 = 2500,
Now SI = 2500 * 10 * 2 ÷ 100 = 500.
On 100 CI for 2 yrs @10% = 21,
Now since CI is 525, therefore, P = 100 ÷ 21 * 525 = 2500,
Now SI = 2500 * 10 * 2 ÷ 100 = 500.
Tina said:
9 years ago
Can anyone explain how -1 at place P?
123 said:
1 decade ago
P = 525 x 100 = 2500.
21 ?
21 ?
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