Question

A money doubles the rate of simple interest in 8 years, how long will it take to become 4 times? (a) 24 years (b) 16 years (c) 32 years (d) 12 years

Answer 1

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ans is 32 years

Answer 2

Answer:

(a) 24 years

Step-by-step explanation:

Let P1=x, A2=2x , S.I.1 = 2x - x = x

So, S.I.1 = P1*N1*R /100

           x = x*8*R/100

So, R = 100/8

Let P2=x, A2=4x , S.I.2 = 4x - x = 3x

So, S.I.2 = P2*N2*R /100

         3x = x*N2* 100/8 * 1/100

N2 = 24 years