[ Aaargh! ]

1. Teaching Math In 1950s

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 Math In 1960s

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 Math In 1970s

A logger sells a truckload of lumber for $100. His cost of production is $80. Did he make a profit?

Read the whole thing, it goes on to do the 80's, 90's, and 00's too. Painfully true, I'm afraid.

It goes on to do the 80's, 90's, and 00's too.

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