Question

At simple interest, a sum of money is doubled in 20 years. What is the rate of interest?

Answer 1

let principal be rs. 100

so amount will be

200

time will be 20 years

si = PTR //100

= 100.20.r//100

=20r

now proceed

Answer 2

Answer:

20r

Step-by-step explanation:

let principal be rs. 100  

so amount will be  

200

time will be 20 years  

si = PTR //100

= 100.20.r//100

=20r