Question

at what rate percent per annum will a sum of money be 7 by 5 times itself in 10 years​

Answer 1

Answer:

4% per annum

Step-by-step explanation:

Let the sum be x.

Amount (A) = 7/5x

Simple Interest (SI) = 7/5x - x = 2/5x

Time (T) = 10 years

Let the rate percent be R.

SI = PRT/100

2/5x = x * R * 10 / 100

2/5 = 1/10 * R

Rate = 4% per annum