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.
Nisha said:
6 years ago
How 1 came in place of P ? Can you guys explain me please.
Tanisha said:
5 years ago
@Nisha.
Actually they take the common factor so when we take p common there it is replaced by 1.
Actually they take the common factor so when we take p common there it is replaced by 1.
(2)
Tanisha said:
5 years ago
@Sandy.
Actually this is the formula for finding amount, amount= principle +interest so when we apply the ci. The formula basically finding the amount so when we minus it with the principle it equals to the interest which is 525.
Actually this is the formula for finding amount, amount= principle +interest so when we apply the ci. The formula basically finding the amount so when we minus it with the principle it equals to the interest which is 525.
Tanisha said:
5 years ago
@Babai.
When you divide 10/100 it will give you 1/10 then when you will add it with one it will give you 11/10. Actually it comes in the mixed fraction.
When you divide 10/100 it will give you 1/10 then when you will add it with one it will give you 11/10. Actually it comes in the mixed fraction.
Sagar said:
5 years ago
How p becomes 1, We don't know the value of p right? Explain please.
(1)
Asif said:
5 years ago
In the simplest way, we can slove this by;
Suppose principle amount is 100.
For two years CI 100*10%=10 again 110*10%=21 (total interest).
Total increased 21%, we can take it as 525 is 21% then 100% will be the principle amount which 2500.
Suppose principle amount is 100.
For two years CI 100*10%=10 again 110*10%=21 (total interest).
Total increased 21%, we can take it as 525 is 21% then 100% will be the principle amount which 2500.
(8)
Lokesh said:
1 year ago
Hello guys.
The simplest way is;
Here the sum will be the same.
C. I for 2yrs@10%p.a is;
21% = 525.
For S.I 4yrs @5 % p.a is;
20% = 500.
The simplest way is;
Here the sum will be the same.
C. I for 2yrs@10%p.a is;
21% = 525.
For S.I 4yrs @5 % p.a is;
20% = 500.
(2)
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