On the first of January you place $100 into your bank account. On the first of each month after that you
deposit an additional $100. Unfortunately, in the middle of the month you always withdraw 70% of your
money to pay bills.
a. How much money is in the account at the end of March?
b. How much money is in the account at the end of n months?
c. According to your rule, when will you have a balance of zero?
