Question

a sum of money double in 10 years the rate of interest per annum is​

Answer 1

Answer:

Let the principal be x

Time = 10 years

Amount after 10 years gets doubled

So amount = 2x

simple interest = amount - principal

simple interest = 2x - x = x

Rate per annum = SI × 100 / P × T

= x × 100 / x × 10

100x/ 10x = 10

So rate per annum = 10%