Aptitude - Compound Interest - Discussion
Discussion Forum : Compound Interest - General Questions (Q.No. 11)
11.
Simple interest on a certain sum of money for 3 years at 8% per annum is half the compound interest on Rs. 4000 for 2 years at 10% per annum. The sum placed on simple interest is:
Answer: Option
Explanation:
| C.I. |
|
|||||||||||
|
||||||||||||
| = Rs. 840. |
 Sum = Rs. |
 |
420 x 100 |  |
= Rs. 1750. |
| 3 x 8 |
Discussion:
40 comments Page 2 of 4.
Tenzin kalden said:
1 decade ago
Hi @Ishaan, Let me explain.
SI = prt.
CI = p(1+r)^n.
First we have to find CI = 4000(1+10/100)^2 = 4840.
So let me tell me why we minus 4000, Because to get the actual int
from amt 4840-4000 = 840.
SI = prt.
CI = p(1+r)^n.
First we have to find CI = 4000(1+10/100)^2 = 4840.
So let me tell me why we minus 4000, Because to get the actual int
from amt 4840-4000 = 840.
Tamanna said:
1 decade ago
From where this 420 came from?
Chitra padmanaban said:
1 decade ago
In the question mention the half of the C.I We get C.I=840 so in S.I=420.
So,
S.I = pnr/100.
420 = p.3.8/100 simplify it got the answer.
So,
S.I = pnr/100.
420 = p.3.8/100 simplify it got the answer.
Rukh said:
1 decade ago
I am not getting till now why 4000 subtract there, in rest of the question we don't deduct it.
Virus said:
1 decade ago
@Tamanna.
In question simple interest ll calculate with half of C.I. Find C.I first then so CI = 840 then we get it half so 420. Then u SI formula you'll get it.
In question simple interest ll calculate with half of C.I. Find C.I first then so CI = 840 then we get it half so 420. Then u SI formula you'll get it.
Ishu said:
1 decade ago
What is the formula for sum? Can anyone please explain me?
Rakesh said:
1 decade ago
See friends.
P = 4000.
R = 10.
T = 2 years.
So, C.I = P(1+r/100)^n.
C.I = 4000(110/100*110/100).
C.I = 4000(11/10*11/10).
C.I = 40*121.
C.I = 4840.
Then 4840-4840 = 840.
Given that half of the C.I i.e. 420.
= 420 = P*3*8/100 = 1750.
P = 4000.
R = 10.
T = 2 years.
So, C.I = P(1+r/100)^n.
C.I = 4000(110/100*110/100).
C.I = 4000(11/10*11/10).
C.I = 40*121.
C.I = 4840.
Then 4840-4840 = 840.
Given that half of the C.I i.e. 420.
= 420 = P*3*8/100 = 1750.
Prashant said:
1 decade ago
Is there any short cut for this question?
Rakesh said:
1 decade ago
If p = 420.
Now 420*3*8/100 = 100.8 after solving I get.
Then how can value is 1750?
Now 420*3*8/100 = 100.8 after solving I get.
Then how can value is 1750?
Diya sharma said:
9 years ago
Please, any body explain it in a proper way and completely.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers