Question

Sum of a money doubles itself in 10 years at simple interest. In how many years would it treble itself...??

Answer 1

Answer: 20 years

Step-by-step explanation:

Let the sum (principal) = P

Amount in 10 years = 2 P

Interest = A - P = 2P - P = P

I = PNR/100

P = P*10*R/100

1 = R/10

R = 10%

Now, P becomes 3 P in?

I = 2 P

2 P = P*N*10/100

2 = N/10

N = 20 years