Question

A sum of money doubles in 4 years. Calculate the rate of interest. At the same rate, how much time will it take to amount to four times?​

Answer 1

Answer:

A=P(1+ 100R) T

2x=x(1+ 100R ) 4

(1+ 100R )=2 1/4

8x=x(1+100R ) T

∵1+ 10R =2 1/4

∴8=2 T/4

2 3 =2 T/4

4T =3

T=12years

So your answer is 12 years..

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Hope this helps ☺️☺️

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