we use the formula of the simple interest
[tex]C=c(1+n\cdot\frac{i}{100})[/tex]where C is the total capital, c the initial capital, the number of years and i the value fo the interest
then replacing
[tex]C=600(1+(15)\cdot\frac{(6.5)}{100})[/tex]and solving
[tex]\begin{gathered} C=600(1+0.975) \\ C=600(1.975) \\ C=1185 \end{gathered}[/tex]The final valance into the acoount will be $1185
Interest earned
[tex]1185-600=585[/tex]is $585
