Need help creating my own problem. Need to specify which formula im using for the equation.

Saving for college You have graduated from Augsburg and are working. What is your profession? How many years have you worked in your profession? What is your monthly pretar income at that point in your life? Do you have a spouse/partner who is contributing to the monthly pre-tax income? If so, how much are they contributing? You are saving to put your 2 children through college. How old are they now? What will their ages be when they enter college? What will tuition be then? Public college or private college? You plan to put away a fixed amount of money each month from now until they graduate. How much can you afford to save each month? In what type of account will you invest your money (CD, money market, savings account, bond mutual fund, stock mutual fund, 529, etc.)? What interest rate can your money earn? One question should be to determine how much you need to save each month now