The revenue R (in millions of dollars) for a beverage company is related to its advertising expense by the function
R = 1/100,000 (-x3 + 600x2), 0 ‰¤ x ‰¤ 400
Where x is the amount spent on advertising (in tens of thousands of dollars). Use the graph of this function to estimate the point on the graph at which the function is increasing most rapidly. This point is called the point of diminishing returns because any expense above this amount will yield less return per dollar invested in advertising.

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350 300 250 200 150 100 50 + 100 200 300 400 Advertising expense (in tens of thousands of dollars) Revenue (in millions of dollars)