Pat and Sam own their own business, and have an automatic account builder set up with an investment company. At the end of each quarter, the company automatically deducts $2000 from their business checking account and puts it into a savings account which they have set up for their children's college tuition. The account earns 4.8% annual interest compounded quarterly.

1a. How much would the first $2000 deposit (just the first deposit) ultimately contribute to the amount in account at the end of 18 years? [This is a regular compound interest problem, since it pertains to just one deposit.]

1b. How much will be in the account, in total, after 18 years? [This is an annuity problem, since it pertains to many deposits accumulating to a large sum in the end.]

1c. How much of the account value after 18 years will be interest earned?