Teaching Math in the 1950's:

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math joke

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

Teaching Math in the 1960's:
 
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?
Teaching Math in the 1970's:
 
A logger sells a truckload of lumber for $100. His cost of production is $80. Did he make a profit?
Teaching Math in the 1980's:
 
A logger sells a truckload of lumber for $100. His cost of production is $80 and his profit is $20. Underline the number 20.
Teaching Math in the 1990's:
 
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. )
Teaching Math in the 2000's:
 
Un hachero vende una carretada de maderapara $100. El costo de la producciones es $80. Cuanto dinero ha hecho?