I decide I want to retire to have $2,000,000 when I retire in 20 years. Assuming I can earn 8% interest with interest compounding semi-annually, to solve for how much I need to invest each year to reach my goal, I need to solve for: A PMT (FV ann n = 40 i = 8%) PMT (FV ann n = 40 i = 4%) PMT (PV ann n = 40 i = 8%) $2,000,000 (PV ann n = 40 i = 4%)