Question

a sum of money Doubles itself in 8 years find the rate of interest​

Answer 1

Answer:

let the principal amount be x

after 8 years S.I. equals x  

S.I = PNR/100

X = 8xR/100

100X = 8xR

100x/8x = R

100/8 =R

12.5=R

hence the rate of interest is 12.5%.

Answer 2

Answer:

Step-by-step explanation:

1/8=12.5%