Question

A sum of money becomes 6 times of itself at simple interest in 25 years, how long would it take for same amount to become double?

Answer 1

Answer:

5 years

Step-by-step explanation:

Let the sum be x.

Let the rate be y.

Amount = 6x

SI = 5x

5x = x * 25 *y/100

y = 20%

Amount = 2x

SI=x

Let the time be z.

x = x*20*z/100

z = 5years

Answer 2

Answer:

5 years

Step-by-step explanation:

Let the sum,rate and time be x,y and z respectively

Amount = 6x    SI = 5x            5x=x*25*y/100        y=20%

Amount = 2x        SI = x        Let's take the time = z        x = x*20*z/100    z = 5 years

Hence,

5 years is the correct answer