how to get quedtion 7 &8?

Bernadette has an opportunity to invest $20,000 in a Certificate of Deposit (CD) that will pay her 3.54% annually. When the CD matures in 9 years, how much will Bernadette receive? Note: CD's only pay interest at the end of the period. 7) Assume the same facts as in 6) above, except the interest will be compounded semiannually. When the CD matures in 9 years, how much will Bernadette receive? 8) Assume the same facts as in 6) above, except the interest will be compounded monthly. When the CD matures in 9 years, how much will Bernadette receive