Sixty Years of Math 1950 - 2010 (in the USA )

And to think that math was my favorite subject in school :(

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. Why do I
tell you this? Because of the evolution in teaching math since the
1950s.

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?

4. Teaching Math In 1980s
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.

5. Teaching Math In 1990s
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. )

6. Teaching Math In 2010
Un hachero vende una carretada de maderapara $100. El costo de la
producciones es $80. Cuanto dinero ha hecho........