A friend of Junksmith forwarded him this email:

1. Teaching Maths In 1970:
A logger sells a truckload of lumber 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 lumber 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 lumber for £100. His cost of production is £80. Did he make a profit?
 
4. Teaching Maths In 2000:
A logger sells a truckload of lumber 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 woodlands. He does this so he can make a profit of £20. What do you think of this way of making a living? Topic for class participation after answering the question: How did the birds and squirrels feel as the logger cut down their homes? (There are no wrong answers.)

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