Last week I purchased a burger at Burger King for $1.58. The counter girl
took my $2 and I was digging for my change when I pulled 8 cents from my pocket
and gave it to her. She stood there, holding the nickel and 3 pennies, while
looking at the screen on her register.
I sensed her discomfort and tried to tell her to just give me two quarters,
but she hailed the manager for help. While he tried to explain the transaction
to her, she stood there and cried…

This explains why:

Teaching Math 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?

Teaching Math 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?

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

Teaching Math 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.

Teaching Math In 1990
By cutting down beautiful forest trees, the logger makes $20.
What do you think
of this way of making a living?
Topic for class participation after answering
the question: How did the forest birds and squirrels feel as the logger cut
down the trees (there are no wrong answers).

Teaching Math In 2005
El hachero vende un camion carga de arboles por $100. El costo de production
es.............