Question 1145664
<br>
I = prt<br>
I = interest ($500, or maybe $5000)
p = principal (the original amount invested -- $2000)
r = interest rate (annual -- 2.5%; that is, 0.025)
t = time (years -- the unknown, to be determined)<br>
Plug in the given numbers and solve.<br>
It should be easy; you won't learn anything by having us give you the answer.<br>
Of course, you have to decide whether the interest amount she wants is $500 or $5000, since you show the two different amounts in your post.