Maths through the ages

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 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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I just post the stories, for interest.. for everyone

Lord, what fools these mortals be!
- A Midsummer Night’s Dream, Act III, Scene ii

Voltaire said: "Those who can make you believe absurdities can make you commit atrocities."

H.L.Mencken wrote:"The whole aim of practical politics is to keep the populace alarmed (and hence clamorous to be led to safety) by menacing it with an endless series of hobgoblins, all of them imaginary.”

Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. Albert Einstein

I think they forget to indicate that de-forestaion is caused by humans that bred out of control and just grab more land to be able to breed even more.