We use the formula:
A=P(1+r/12)^12n
where
A=future value
P=present value
r=rate of interest
n=time period.
(2*9000)=9000*(1+0.015/12)^12n
2=(1.00125)^12n
Taking log on both sides;
log 2=12n*log 1.00125
n=1/12[log 2/log 1.00125]
=46.24 years(Approx).
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