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发帖数: 2136 | 1 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. The set "C"
, the cost of production contains 20 fewer points than se | m*****5
发帖数: 23482 | |
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