Bonita contributed $450 at the beginning of every three months to an RRSP. Interest on the account

Question:

Bonita contributed $450 at the beginning of every three months to an RRSP. Interest on the account is 6% compounded quarterly.
(a) What will the balance in the account be after seven years?
(b) How much of the balance will be interest?
(c) If Bonita converts the balance after 7 years into an RRIF paying 5% compounded quarterly, and makes equal quarterly withdrawals for 12 years starting 3 months after the conversion into the RRIF, what is the size of the quarterly withdrawal?
(d) What is the combined interest earned by the RRSP and the RRIF?