The Vanilla Gorilla Ice Cream Company has incurred $$220,000$ in startup costs. These debts earn interest at a rate of $7\mathrm{.}7\%$ compounded quarterly. Suppose the company is able to make payments of $$7500$ at the end of each quarter.

a$)$ Calculate the interest and principal portions of payment $15.$ Enter the interest portion in the first entry field and the principal portion in the second. $(4$ marks$)$

b$)$ What is the size of the final payment? Place this answer in the third entry field. $(6$ marks$)$