a. You decide to make monthly deposits of $280.00 for 10 years into an account which pays 4% compounded monthly. Once the payments stop, you plan to leave the money in the account for an additional 10 years. How much money will be in the account at the end of this time? (Round answer to 2 decimal places)

b. You decide to save $8900 by making semiannual deposits for 9 years into an account which pays 6% compounded semiannually. Once the payments stop, you plan to leave the money in the account for an additional 6 years. What size deposits do you need to make? (Round answer to 2 decimal places)

* When anyone gets a chance, can you help me figure out these couple of parts? I am having trouble to where I cannot figure out the process of what to do here. Both parts count as 1 problem so I would really appreciate the help here. Thanks!