Question 1139803
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800 = 500 + 500*0.015*t


800 - 500 = 500*0.015*t


300       = 500*0.015*t


{{{300/500}}} = 0.015*t


{{{3/5}}} = 0.015*t


t = {{{((3/5))/0.015}}} = {{{0.6/0.015}}} = 40 years.   <U>ANSWER</U>


<U>CHECK</U>.  At this rate, $500 grow by  500*0.015 = 7.50 dollars per year.

        $7.50*40 = 200 dollars = 500 - 300 dollars.   ! Correct !
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