Question

At what rate of interest per annum does a
sum double after 20 years.​

Answer 1

Answer:

5 percent simple interest a sum of money doubles itself in 20 years tell me it's helpful or not?

Answer 2

Answer:

5%

Explanation:

Let us assume the principle amount (P) be x

then , we want amount (A) = 2x in time ( T )

We have to find Rate (R )

as we know

in simple interest

A = (P*R*T/100) + P

=>2x = (x*R*20)/100 + x

=> x = x*R/5

=> R = 5 %