To finance a vacation in 3 years, Elsie saves $470 at the beginning of every 6 months in an account paying interest at 8% compounded semi-annually. (a) What will be the balance in her account when she takes the vacation? (b) How much of the balance will be interested? (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? (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.)