From Mom...

Teaching math to the Class of 1966:
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 to the Class of 1976:
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 to the Class of 1986:
A logger sells a truckload of lumber for $100. His cost of production is $80.
Did he make a profit?

Teaching math to the Class of 1996:
A logger sell s a truckload of lumber for $100. His cost of production is $80 and his profit is $20.
Your assignment: Underline the number 20.

Teaching math to the Class of 2006:
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.)

Teaching math to the Class of 2016:
Un hachero vende una carretada de maderapara 1000 pesos. El costo de la producciones es 800 pesos...