Jacks family starts to save money for his kids future post-secondary education. To save for his kids future post-secondary education, Jack expects that it takes savings for total 18 years. His family deposits $1,200 at the beginning of every year into an education fund earning interest at 4.15% compounded annually.

a) What will be the balance in the fund after 18 years?

(b) How much of the balance will be interest?

(c) If the interest rate increases to 4.65% compounded annually, how much more interest is earned?