Your employer offers a defined contribution plan with a $50\%-$ match of up to $6\%$ of your contributions. They use a six$-$year graduated vesting schedule outlined in Exhibit $4\mathrm{.}2$ of your textbook.

$($a$)$ You decide to contribute $($or defer your compensation$)4\%$ of your $$60,000$ annual salary. What will the total employee and employer nonforfeitable contributions be at your $4$ year employment anniversary?

$($b$)$ You decide to contribute $($or defer your compensation$)8\%$ of your $$60,000$ annual salary. What will the total employee and employer nonforfeitable contributions be at your $4$ year employment anniversary?