4. You want to have $4 million in your taxable investment account when you retire after 45 years. You currently have $10,000 in your investment accounts. You are in the 20% marginal income tax bracket. Your account earns 7% annually. How much do you need to invest at the beginning of each month for the next 45 years to reach your retirement goal? N=I=PV=PMT=FV= END/BGN