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 exchanges a set "L" of lumber for a Set
"M" 
of money. The cardinality of set "M" is 100.� Each element is worth one 
dollar. Make 100 dots representing the elements of the set "M."� The set
"C", 
the cost of production contains 20 fewer points than set "M". Represent
the 
set "C" as a subset of set "M" and answer the following question: What
is the 
cardinality of the set "P" of profits?
�
Teaching Math in 1980:� A logger sells a truckload of lumber for $100.
His 
cost of production is $80 and 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 2000:� A logger sells a truckload of lumber for $100.�
His 
cost of production is $120.� How does Arthur Andersen determine that his

profit margin
is $60?
�
Teaching Math in 2010: El hachero vende un camion carga por $100.� La
cuesta 
de production es.
�

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