Question

An amount of money double itself in 10 year. What is the rate of interest?

Answer 1

interest = P*T*R/TIME 
 SO NOW u shuold use some brain of yours

Answer 2

Answer:

10%

Step-by-step explanation:

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%.