The Revenue from the Sale of X Units of a Commodity

Multiple Choice

The revenue from the sale of x units of a commodity is r(x) Canadian dollars, and u(r) U.S. dollars is the equivalent value of r Canadian dollars. On September 8, 2009, $1 Canadian was worth $1.0764 U.S., and the rate of change of the U.S. dollar value was $0.925 U.S. per Canadian dollar. On the same day, sales were 470 units, producing revenue of $10,000 Canadian, and revenue was increasing by $4.2 Canadian per unit. Evaluate of the given expression on September 8, 2009, and write a sentence interpreting the value.

A) Canadian dollars per unit On September 8, 2009, revenue was increasing by 4.2 Canadian dollars per unit.
B) Canadian dollars per unit On September 8, 2009, revenue was increasing by 470 Canadian dollars per unit.
C) Canadian dollars per unit On September 8, 2009, revenue was decreasing by 8.4 Canadian dollars per unit.
D) Canadian dollars per unit On September 8, 2009, revenue was decreasing by 4.2 Canadian dollars per unit.
E) Canadian dollars per unit On September 8, 2009, revenue was increasing by 8.4 Canadian dollars per unit.