Question

In how many years will a sum be three times of itself at 5% rate of interest per annum?​

Answer 1

Answer:

20 years

Step-by-step explanation:

Let the number of years required = t

Let Principle = P

Amount = 3P

Interest earned = 3P - P = 2P

Now using formula SI = PRT/100, we have

2P = P x 10 x t/100

2 = 10 x t/100

t = 200/10 = 20 years

Answer 2

Answer:

your answer is 40 years

Step-by-step explanation:

Let the number of years required = t

Let Principle = P

Amount = 3P

Interest earned = 3P - P = 2P

Now using formula SI = PRT/100, we have

2P = P x 5 x t/100

2 = 5 x t/100

t = 200/5 = 40 years

hope it helps you