Aptitude - Simple Interest - Discussion

Discussion Forum : Simple Interest - General Questions (Q.No. 4)
4.
How much time will it take for an amount of Rs. 450 to yield Rs. 81 as interest at 4.5% per annum of simple interest?
3.5 years
4 years
4.5 years
5 years
Answer: Option
Explanation:

Time = 100 x 81 years = 4 years.
450 x 4.5

Video Explanation: https://youtu.be/WdBzN0Sj8jc

Discussion:
65 comments Page 4 of 7.

Khushi said:   6 years ago
What is the difference between the Amount (A) and principle (P)? Please, explain!

Kimi said:   5 years ago
@Khusi.

Amount, the principal is the money which we lend for example I want to take 50 rupees from the bank so that will be loan or pricipal after 1 year the bank also want s s profit so they give a rate of interest for eg 2 pc so simple interest is prt/100 which will be 1 so at the end of the year they will have to give bank 501 rupees which is the amount.

So a=si + p.

Retty said:   5 years ago
Is amount and principal same? Please explain me.

Lukman Ibrahim said:   4 years ago
How to get 4 years? Please anyone explain.

Sumit said:   1 decade ago
t = ?
P = Rs.450.
S.I = 81.
R = 4.5%.

As we know : SI = P*R*T/100.
: T = S.I*100/P*R.
i.e: 81*100/450*405 = 4 yr.

Dilepkumar said:   2 decades ago
si=ptr/100
p=sum
t=time
r=rate of intrest

Jineesh k b said:   1 decade ago
450*4.5/100=20.25
20.25*4=81(from option)

Ratna prathibha said:   1 decade ago
I want to know the formula for converting from percentge to years and amount to years.

Ragu said:   1 decade ago
(100*81/450*4.5)=(2*81/9*4.5)=(2*2/4.5)

so 4/4.5=4 (given ans)but

4/4.5=0.8888

So my doubt is how the ans was 4 years? can anyone explain me clearly?

Beni said:   1 decade ago
1. T = S.I x 100/p x r
2. 81 * 100/4.5 * 450
3. if you simplify it 4 comes as the answer.


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