Question

An amount of money invested trembled in 6 years. Find the rate of interest earned.

Answer 1

Let the principle be x
Interest = 3x-x = 2x
Rate = R% (let)
Time = 6years

Using,
I = (P*R*T)/100

2x = (x*R*6)/100
200x =6xR
R = 200x/6x
R =
$33 \times \frac{1}{3} \%$