18. Mrs. Gustufson desires to have $1,000,000 seventeen years from now for her daughter's college fund. If she can earn 5 percent on her money, what amount should she deposit now? 19. John invested $10,000 in 2009 and received $25,000 in 2019. What was his rate of return on his investment? 20. How long will it take to double your money at 8% interest compounded annually