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 5 of 7.
Preethi said:
1 decade ago
Why here we take t=r?
Chandra Kiran.Baru said:
1 decade ago
P = 1200.
I = 432.
Time = r.
Rate = r%.
S.I = ptr\100.
432 = 1200*r*r\100.
R2 = 432\12.
R2 = 36 = 6.
I = 432.
Time = r.
Rate = r%.
S.I = ptr\100.
432 = 1200*r*r\100.
R2 = 432\12.
R2 = 36 = 6.
Raja said:
1 decade ago
Please tell me why we take t=r and what is the meanings of many years?
Ganeshgoud said:
1 decade ago
R = (S.I*100/P*T).
S.I = 432;
P = 1200;
T = R;
R = 432*100/1200*R.
R2 = 36.
R = 6.
S.I = 432;
P = 1200;
T = R;
R = 432*100/1200*R.
R2 = 36.
R = 6.
Patricia baldimo said:
1 decade ago
Why do we have a 100?
Arif said:
1 decade ago
@Tejas.
According to question Reena took a loan of Rs. 1200 with simple interest for as many years as the rate of interest.
It means rate of interest and time duration both are equal.
According to question Reena took a loan of Rs. 1200 with simple interest for as many years as the rate of interest.
It means rate of interest and time duration both are equal.
Rajesh said:
1 decade ago
Assume 6 as time and rate of interest.
Then 6% of 1200 is 72.
For six years means (72*6) = 432.
Hence our assumption is correct and 6 is the answer.
Then 6% of 1200 is 72.
For six years means (72*6) = 432.
Hence our assumption is correct and 6 is the answer.
Mhndr said:
1 decade ago
Friend, There you can use,
t = r = x.
Then r=t or x,
t = r or x.
Thus, r^2 or t^2 or x^2. Hope now you understand.
t = r = x.
Then r=t or x,
t = r or x.
Thus, r^2 or t^2 or x^2. Hope now you understand.
Gaurav said:
1 decade ago
Can anyone solve this, by using the following formula,
S.I=P*N*R/100,
where, S.I=Simple Interest,
P=Principal Amount.
N= Period of time.
and, R= Rate of Interest.
S.I=P*N*R/100,
where, S.I=Simple Interest,
P=Principal Amount.
N= Period of time.
and, R= Rate of Interest.
Rajan Kumar said:
1 decade ago
Because rate is equal to year they given in question itself.
so we took t=r we can also write like r=t=r all are same in this question.
so we took t=r we can also write like r=t=r all are same in this question.
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