Teaching Math In 1960
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 1970
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 1980
A logger sells a truckload of lumber for $
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