Aptitude - Simple Interest - Discussion

Discussion Forum : Simple Interest - General Questions (Q.No. 1)

Simple Interest

A sum of money at simple interest amounts to Rs. 815 in 3 years and to Rs. 854 in 4 years. The sum is:

Rs. 650

Rs. 690

Rs. 698

Rs. 700

Answer: Option

Explanation:

S.I. for 1 year = Rs. (854 - 815) = Rs. 39.

S.I. for 3 years = Rs.(39 x 3) = Rs. 117.

Principal = Rs. (815 - 117) = Rs. 698.

Discussion:

171 comments Page 8 of 18.

Pradeep said: 9 years ago

Let 1 yr int .....x.
3yr int.......3x.
4yr int........4x.
(P+4x) - (P+3x) = 854 - 815,
x = 39.

Nirmala said: 8 years ago

Why we are not substructing 854? Please explain.

Manya said: 8 years ago

Thanks a lot @Gayatri.

Anusha said: 8 years ago

Very helpful to understand the solution. Thanks for all your explanation.

Surjeet said: 8 years ago

Because we calculate with 3 years that is why we subtract from 815.

Deepthy said: 8 years ago

Thanks @Pradeep.

Sunil said: 8 years ago

Thanks, I like this explanation.

This is helpful to understand the simple interest.

Pawan said: 8 years ago

How can we apply formula 100*SI/RT?

Here R is not given.

Marikkannan said: 8 years ago

Thanks for all the explanation. It is a very helpful solution.

Ashwini said: 8 years ago

A2T1-A1T2/T1-T2.

The above formula is applies here,
854 * 3-815 * 4/3-4,
2562-3260/-1,
= 698.

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