1. Teaching maths in 1970:
A logger sells a truckload of timber for $100. His cost of production is 4/5 of the price. What is his profit?
2. Teaching maths in 1980:
A logger sells a truckload of timber for $100. His cost of production is 4/5 of the price, or $80. What is his profit?
3. Teaching maths in 1990:
A logger sells a truckload of timber for $100. His cost of production is $80. Did he make a profit?
4. Teaching maths in 2000:
A logger sells a truckload of timber for $100. His cost of production is $80 and his profit is $20. Your assignment: underline the number 20.
5. Teaching maths in 2008:
A logger cuts down a beautiful forest because he is selfish and inconsiderate and cares nothing for the habitat of animals or the preservation of our native trees. He does this so he can make a profit of $20. What do you think about this way of making a living? Topic for class discussion: how did the birds and insects feel as the logger cut down their homes? (There are no wrong answers.)
