“The Evolution of a Mathematical Problem”: 1960: A lumberjack sells a truckload of lumber for $100. His cost of production is 4/5 of this price. What is his profit? 1970: A lumberjack sells a truckload of lumber for $100. His cost of production is 4/5 of this price, or in other words $80. What is his profit? 1980: A lumberjack sells a truckload of wood for $100. His cost of production is $80, and his profit is $20. Your assignment: Underline the number 20. 1990: By cutting down beautiful forest trees, a lumberperson makes $20. What do you think of his or her way of making a living? In your
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