The annual worth for years 1 through infinity of $50,000 now, $10,000 per year in years 1 through 15, and $20,000 per year in years 21 through infinity at 10%/year is closest to a. Between $15,400-$15,800 b. Between $15,800-$16,200 c. Between $16,200-$16,600 d. Higher than $16,600