Your uncle plans to retire in 20 years. He currently has $500,000, and think he will need $2,500,000 at retirement. If he can save $10,000 at the end of each year in the following 20 years, what annual rate of interest must he earn to reach his goal? 8.50% a. 9.00% b. 10.12% C. 7.35% d. 9.44% e