History of Math

Teaching Math in 1952: 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 1962: 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 1972: 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 1982: 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 1992: 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 2002: A logger sells a truckload of lumber for $100. 
His cost of production is $120. Arthur Andersen determines that 
his profit is $60. How much is his stock in the company worth?