Question

at what rate percent per annum simple interest will a sum double itself in 10 years

Answer 1

10% is the answer the workout is given in the picture attached

Answer 2

Answer:

The rate of interest will be 20% per annum.

Step-by-step explanation:

Let the principal be "x"

and simple interest be "2x"

and rate of interest be "r"

and time=10 years.

Formula used:

simple interest* 100 = principal * rate of interest*time

2x*100= x*r*10

200x=x*10*r

200=10r

r=20%

Hence the rate of interest will be 20% per annum.

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