Aptitude - Compound Interest - Discussion
Discussion Forum : Compound Interest - General Questions (Q.No. 2)
2.
The difference between simple and compound interests compounded annually on a certain sum of money for 2 years at 4% per annum is Re. 1. The sum (in Rs.) is:
Answer: Option
Explanation:
Let the sum be Rs. x. Then,
| C.I. = |  |
x |  |
1 + | 4 |  |
2 | - x |  |
= | |
676 | x | - x | |
= | 51 | x. |
| 100 | 625 | 625 |
| S.I. = | |
x x 4 x 2 | |
= | 2x | . |
| 100 | 25 |
 |
51x | - | 2x | = 1 |
| 625 | 25 |
x = 625.
Discussion:
149 comments Page 8 of 15.
AKSHAY said:
1 decade ago
The correct formula is (ci-si) (100/r) (100/r) = p.
NOTE: (THIS FORMULA IS FOR TWO YEARS ONLY).
NOTE: (THIS FORMULA IS FOR TWO YEARS ONLY).
Puneet said:
8 years ago
Anyone can please tell why we have to subtract x from C.I?
and 51x/625-2x/25=1 so x=625 how?
and 51x/625-2x/25=1 so x=625 how?
$weth@ said:
10 years ago
Is that a formula you used over there?
[x(1+4/100)2]-x? where and all we can use this?
[x(1+4/100)2]-x? where and all we can use this?
Raja said:
1 decade ago
What is the shortcut formula to find differences of ci and si for 4 years and 5 years?
Shivesh said:
9 years ago
Derivation of this formula.
Principal x (r%/100)^2 = Difference between interests.
Principal x (r%/100)^2 = Difference between interests.
Nivash said:
2 years ago
Let the sum be Rs. x.
Then,
ci = (x(1 + r/100)^n - x ) why subtracting with x again?
Then,
ci = (x(1 + r/100)^n - x ) why subtracting with x again?
(32)
Ankit said:
9 years ago
CI for 2 years - SI for 2 years = PR^2/100^2.
1 = P16/10000,
10000/16 = P,
P = 625.
1 = P16/10000,
10000/16 = P,
P = 625.
Bhavani said:
6 years ago
S.P - C.I = 1.
p = 1 (100/4)^2.
= 1(100 x 100/4 x 4).
= 25 x 25.
= 625.
p = 1 (100/4)^2.
= 1(100 x 100/4 x 4).
= 25 x 25.
= 625.
Ganga said:
1 decade ago
@Pankaj parashar.
Please tell me how CI rate for 2 years = 8.16%.
Please help me.
Please tell me how CI rate for 2 years = 8.16%.
Please help me.
Revathi said:
8 years ago
CI-si=p(r/100)^2 this formula applicable for more than 2 yrs also.
Am I correct?
Am I correct?
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