Aptitude - Simple Interest - Discussion

Why we are not substructing 854? Please explain.

Thanks a lot @Gayatri.

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

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

Thanks @Pradeep.

Thanks, I like this explanation.

This is helpful to understand the simple interest.

How can we apply formula 100*SI/RT?

Here R is not given.

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

A2T1-A1T2/T1-T2.

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

Hi, I cannot understand one thing that how could be the amount increasing every year is constant?

I mean if suppose 100 is the principle and rate is 10 percent then for the first year the amount will be 110, 2nd year it will be 121, 3rd year it will be 133.10.

Now 133.1 -121 is not equal to 121-110 also not equal to 110 -100 so the increasing amount is not constant. In this problem, how can we take the increasing amount constant and directly subtract it and divide it?

I mean how is it possible that the increasing amount remains 39 over three years?