Your Aunt put some money in a bank account for you on the day you were born which you could have when you were 18 years old. The account pays a fixed 4% rate of interest until the first withdrawal is made. On your eighteenth birthday the account had 41,666 in it.

a. How much money would be in the account if you left the money until your 21st birthday?

b. How much money would be in the account if you left the money until your 70th birthday?

c. How much did your aunt originally put into the account?