Question

if a principal is getting doubled after 4 years then calculate the rate of interest​

Answer 1

Answer:

25% per annum

Explanation:

Let the Principal be P.

Amount = 2P

Simple Interest (SI) = 2P - P = P

Time (T) = 4 years

Let the Rate of interest be R.

SI = PRT/100

P = P × R × 4 / 100

R = 25% per annum