To finance a vacation in four years, Elsie saves $530 at the beginning of every three months in an account paying interest at 3.92% compounded quarterly.
(a) What will be the balance in her account when she takes the vacation?
(b) How much of the balance will be interest?
(c) If she waits an additional year to start her vacation, and continues to save the same amount of money, how much more money does she have to spend?