I can't figure this out for the life of me:

1. Rachel deposits $200.00 into her retirement plan each month and the company that she works for deposits half of Rachel’s monthly deposits into her retirement plan as well. The retirement plan earns 6% per year, compounded monthly, with an interest rate per period of 0.5% (0.005). Rachel wants to retire in 30 years.

2. Rachel would have $597,447.00 in her retirement plan if she decided to retire in 40 years instead of in 30 years. How much extra money would Rachel have in her retirement plan by retiring in 40 years instead of in 30 years?

3. It is important to remember Rachel and her company will only deposit $36,000 into her retirement plan during the extra 10 years if she decided to retire after 40 years instead of 30 years. The rest of the extra money in her account is the result of compound interest. How much of the extra money earned during the extra 10 years is a result of the compounded interest?