TEACHING MATH from 1950 through 2010:

IN 1950: A logger sells a truckload of lumber for $100. His cost of production is 4/5 of the price. What is his profit?

IN 1960: 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?

IN 1970: A logger sells a truckload of lumber for $100 His cost of production is $80. Did he make a profit?

IN 1980: 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.

IN 1990: 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, and if you feel like crying, it's ok.)

IN 2000: Same question as in 1990 but if you have special needs or just feel you need assistance because of race, color, religion, sex, age, childhood memories, criminal background, then don't answer and the correct answer will be provided for you.

IN 2010: Un hachero vende una carrtada de madera para 100 pesos. El costo dela producciones es 80 pesos. Cuanto dinero ha hecho?

From my email (and not far off the truth).