Revenue of a Travel Agency Suppose that the total revenue realized by the Odyssey Travel Agency is R = f(x) thousand ollars if x thousand dollars are spent on advertising. f(b) – f(a) (0 < a < b) measure? What are the units? (a) What does b - a This measures the instantaneous rate of change in the revenue when x thousand dollars are spent on advertising. The units are thousands of dollars per thousands of dollars. This measures the total revenue when a thousand dollars are spent on advertising. The units are thousands of dollars. This measures the total revenue when b thousand dollars are spent on advertising. The units are thousands of dollars. This measures the average rate of change in revenue as the expenditure changes from a thousand dollars to b thousand dollars. The units are thousands of dollars per thousands of dollars. This measures the average rate of change in revenue as the expenditure changes from b thousand dollars to a thousand dollars. The units are thousands of dollars per thousands of dollars. (b) What does f'(x) measure? Give units. This measures the instantaneous rate of change in the revenue when x thousand dollars are spent on advertising. The units are thousands of dollars per thousands of dollars. This measures the total revenue when a thousand dollars are spent on advertising. The units are thousands of dollars. This measures the total revenue when b thousand dollars are spent on advertising. The units are thousands of dollars. This measures the average rate of change in revenue as the expenditure changes from a thousand dollars to b thousand dollars. The units are thousands of dollars per thousands of dollars. This measures the average rate of change in revenue as the expenditure changes from b thousand dollars to a thousand dollars. The units are thousands of dollars per thousands of dollars. (c) Given that f'(25) = 5, what is the approximate change in the revenue if Odyssey increases its advertising budget from $25,000 to $26,000? $4