Question

on what sum does the difference between the compound interest and simple interest for 3 yrs at 10 percent is Rs 31.
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Answer 1

On the sum of 1000 Rs.

Let me now explain it how.

Actually, there is a formula for it.

to find difference for three years between CI and SI = P (R/100)^2 (3+r/100)

if you put the values you will get your answer.

Answer 2

hey ...here's ur solution !!

Difference between SI and CI for 3 yrs = 31 Rs.

P ( 10/ 100) ² ( 300 + 10/ 100 ) = 31

p = (31 × 100× 100 ) / 310

= 1000 Rs.

hope it might be helpful !!