Question

At what rate of interest will a sum of money doubles itself in 20 years?

Answer 1

Answer:

Given:

Time = 20 years

Let p = x

S.I. = 2x

By formula, we know:

S.I. = PRT/100

=> 2x = x × 20 × R/100

=> R = 10%

Rate of interest = 10%

Hope it Helps!! :)

Answer 2

Answer= 5%

Step-by-step explanation:

let principal= 100/

amount will be 200

simple interest= 200 - 100 = 100

simple interest = P×R×T/100

100= 100×R ×20/100

100=20R

R = 100/20

R = 5%