Carow Industries has just started to deposit $500 at the end of each month into its employees retirement fund (i.e., the first deposit will take place one month from now). These deposits will continue for each employee until they retire. Phillip Powell, an employee at Carow Industries is planning to retire in 15 years. When he retires, Phillip would like to withdraw $5,000 per month (at the end of the month) from his retirement account for the following 25 years. If Phillip currently has $50,000 invested and he can earn 7.2% APR, compounded monthly on all money invested (including the money deposited by Carow), how much will he need to put into the account at the end of each month for the next 15 years in order to have enough money to retire and make the withdrawals as planned?