The simple interest formula is given by:
[tex]FV=PV(1+in)[/tex]FV: future value
PV: present value
i: interest rate
n: interest periods
We have from the question:
FV: $5000
PV: ?
i: 5.8%
n: 9.
Then:
[tex]5000=PV(1+(0.058\cdot9))[/tex]Thus
[tex]PV=\frac{5000}{1.522}\Rightarrow PV=3285.15[/tex]Then, we should invest in $3285.15 to have $5000 in 9 years.