Aptitude - Simple Interest - Discussion
Discussion Forum : Simple Interest - General Questions (Q.No. 5)
5.
Reena took a loan of Rs. 1200 with simple interest for as many years as the rate of interest. If she paid Rs. 432 as interest at the end of the loan period, what was the rate of interest?
Answer: Option
Explanation:
Let rate = R% and time = R years.
| Then, |  |
1200 x R x R |  |
= 432 |
| 100 |
12R2 = 432
R2 = 36
R = 6.
Video Explanation: https://youtu.be/TjjI4iRkzT0
Discussion:
62 comments Page 4 of 7.
Yousuf Mayuri said:
9 years ago
If Reena took Rs. 1200.
SI = P * R * T/100.
She paid of Rs. 432 at the end of the loan period.
Here, rate of interest is directly proportional to time.
P= 1200
SI= 432
R= ?
T=R
Therefore , SI = P * R * T/100.
432= 1200 * R * T=R/100,
432=1200 * R * R/100,
432=1200 * R^2/100,
432= 12 * R^2,
432/12 = R^2,
36 = R^2,
OR
R^ = 36.
Therefore, R = 6 Answer.
SI = P * R * T/100.
She paid of Rs. 432 at the end of the loan period.
Here, rate of interest is directly proportional to time.
P= 1200
SI= 432
R= ?
T=R
Therefore , SI = P * R * T/100.
432= 1200 * R * T=R/100,
432=1200 * R * R/100,
432=1200 * R^2/100,
432= 12 * R^2,
432/12 = R^2,
36 = R^2,
OR
R^ = 36.
Therefore, R = 6 Answer.
Teja said:
9 years ago
@All.
First I too confused each subject has its own style of language. Here in the problem itself said r = t and asked interest so r placed here if they ask time means T-square.
First I too confused each subject has its own style of language. Here in the problem itself said r = t and asked interest so r placed here if they ask time means T-square.
Geeta said:
9 years ago
Why we take replace of T?
Rudragouda said:
9 years ago
Why we need to take R here is there any rule for that? Please tell me.
Avana said:
9 years ago
So how about making T = x.
It will reach in a point of,
36 = r * x.
In order to make one as subject take the two latter as square and it will lead into 6.
r = 6,
x = 6,
r * x = 36,
6 * 6 = 36.
It will reach in a point of,
36 = r * x.
In order to make one as subject take the two latter as square and it will lead into 6.
r = 6,
x = 6,
r * x = 36,
6 * 6 = 36.
Swa said:
9 years ago
R = 100 * si/p * t.
R^2 = 100 * 432/1200.
So 36, Here we are not taking T. Simply we took R as square because R = T.
R^2 = 100 * 432/1200.
So 36, Here we are not taking T. Simply we took R as square because R = T.
Brizelda said:
9 years ago
What is p?
MAHAVEER said:
9 years ago
The answer is D.
Because It is not mentioned in the question that rate of interest and time duration both are equal.
Because It is not mentioned in the question that rate of interest and time duration both are equal.
RM Doubt said:
1 decade ago
It is not mention in the question that rate of interest and time duration both are equal.
Rajasekar said:
1 decade ago
How you could take the interest (R) and no of the years (R) both are same constant/Value as R?
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