Wynken has three years of college, Blynken has two, and Nod has one. The difference in educational attainment is completely the result of different discount rates. Wynken earns $21 per hour, Blynken earns $19, and Nod earns $16. The wage rate for high school grads is $10. Calculate the rates of return and use this data to put a range on each man’s discount rate?