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700=4000(0.65)^x

first devide both sides by 4000

7000/4000=4000/4000(0.65)^x

7/4=(0.65)^x

get log of both sides

log(7/4)=log(0.65)^x

0.24=xlog(0.65)

x=0.24/(0.187)

x=1.28

x=1 year

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