To find the amount of money you will have after 30 years use the next formula (when the interest is simple):
[tex]A=P(1+r\cdot t)[/tex]P is the principal amount
r is the interest rate in decimals
t is the time in years
[tex]\begin{gathered} A=3000(1+(0.06)(30)) \\ A=3000(1+1.8) \\ A=3000(2.18) \\ A=8400 \end{gathered}[/tex]Then, the amount after 30 years is $8,400