Question 1116989
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To earn ! ! !
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<pre>
Interest earned in two years = P*0.08*2,


where P is the original/initial invested amount.


So you have this equation  800 = P*0.08*2,  which implies


P = {{{800/(0.08*2)}}} = 5000.


<U>Answer</U>. Andrea must invest 5000 dollars to get her goal.
</pre>


<U>Be aware</U> : &nbsp;&nbsp;The answer given by &nbsp;@Stan &nbsp;is &nbsp;&nbsp;<U>heavily wrong</U>.