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 5 of 15.
SAILAJA said:
1 decade ago
CI-SI=1,
T=2
R=4
P=?
SHORTCUT IS
CI-SI=P(R/1OO)^2
1=P(4/100)^2
P=625
T=2
R=4
P=?
SHORTCUT IS
CI-SI=P(R/1OO)^2
1=P(4/100)^2
P=625
Priya said:
1 decade ago
C.I-S.I=P(R/100)^2
IS THIS FORMULA CORRECT?
IS THIS FORMULA CORRECT?
Siri said:
1 decade ago
Shortcut method: difference= sum (rate/100) ^2.
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).
Pankaj parashar said:
1 decade ago
Short cut method:
si rate for 2 years=8%
ci rate for 2 years=8.16%
diff=.16% ie is equal to re 1
so 1/.16*100=625
si rate for 2 years=8%
ci rate for 2 years=8.16%
diff=.16% ie is equal to re 1
so 1/.16*100=625
Suresh said:
1 decade ago
Please tell me anyone why are subtract X from first step?
Ankit gupta said:
1 decade ago
Apply formula :
CI-SI= p(r/100)^2 this formula works only for t=2 years;
CI-SI = p[(r/100)^3+3(r/100)^2] for t=3 years;
CI-SI= p(r/100)^2 this formula works only for t=2 years;
CI-SI = p[(r/100)^3+3(r/100)^2] for t=3 years;
Srikant Duppada said:
1 decade ago
FORMULA:
Principal x (r%/100)^2 = Difference between interests.
Principal x (r%/100)^2 = Difference between interests.
Manu said:
1 decade ago
The question is to find the sum of CI & SI. The answer we got is the principle, not the sum. Please correct if I am Wrong.
V panindraa said:
1 decade ago
Sum = (10,000 * difference) / r*r.
THIS FORMULA IS FOR TWO YEARS ONLY.
THIS FORMULA IS FOR TWO YEARS ONLY.
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