Aptitude - Simple Interest - Discussion
Discussion Forum : Simple Interest - General Questions (Q.No. 12)
12.
What will be the ratio of simple interest earned by certain amount at the same rate of interest for 6 years and that for 9 years?
Answer: Option
Explanation:
Let the principal be P and rate of interest be R%.
 Required ratio = |
|
= | 6PR | = | 6 | = 2 : 3. | ||||
|
9PR | 9 |
Video Explanation: https://youtu.be/GaaEDwTWc6w
Discussion:
16 comments Page 1 of 2.
Insaan said:
1 decade ago
Simple way is
S.I is directly proportional to T, we can write
S1/S2 = T1/T2
= 2/3
S.I is directly proportional to T, we can write
S1/S2 = T1/T2
= 2/3
Angle said:
1 decade ago
Lets interest of certain amount is X.
so after 6 year is 6X and after 9 year is 9X.
For Ratio ==> 6X : 9X = 2:3
so after 6 year is 6X and after 9 year is 9X.
For Ratio ==> 6X : 9X = 2:3
Anchal said:
1 decade ago
Dear Insaan and Angle, we know we got same Ans from your's method. But there is no any logic. Thats why we have to needed the interest formula. And through the interest formula we can also find out ratio even in different rate of interest.
Ashik said:
1 decade ago
Assume the amount=100
If interest is 10% ,amount of interest is 10 rs.
then the amount of interest for 6 yrs = 6*10 rs = 60 rs
and for 9 yrs amt of interest for 9 years = 9*10 rs = 90rs
For ratio, s1/s2 = 60/90 = 2/3.
If interest is 10% ,amount of interest is 10 rs.
then the amount of interest for 6 yrs = 6*10 rs = 60 rs
and for 9 yrs amt of interest for 9 years = 9*10 rs = 90rs
For ratio, s1/s2 = 60/90 = 2/3.
Prasant said:
1 decade ago
Is it clear from the question that the pricipal amount is same in both the cases?
Manoj said:
1 decade ago
But in question it is not mentioned that principal is same.
Prem said:
9 years ago
Yes, Agree with Manoj.
Indramani said:
8 years ago
Answer should be data inadequate. Suppose principal is 100 and we take 5% interest, then after 6yrs it will be 130 and after 9 years it will be 145. Solving this gives 26/29 which is not equal to 2/3.
Ujju said:
7 years ago
P and R is constant.
Then ratio = t1/t2.
Then ratio = t1/t2.
Amrik singh said:
6 years ago
3:2 is correct. Not 2:3 because rate of interest is inversly proportional to time.
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