equation for 30,000 invested at 3% per year, withdrawing 750 per month until zero balance

Question

Investing $30K and earning 3% per year but need to withdraw $750 per month for living expenses.  What is the formula I would need to calculate remaining balance each month?

Answer 1

I think we need to know how that 3% per year happens.  It's compound interest, but is it being compounded at the end of each year, or compounded monthly, or compounded continuously?  This will affect the answer.