Find the point of diminishing returns (x,y) for the function R(x), where R(x) represents revenue (in thousands of dollars) and x

Question

Find the point of diminishing returns (x,y) for the function R(x), where R(x) represents revenue (in thousands of dollars) and x represents the amount spent on advertising (in thousands o
dollars).
R(x) = 10,000-x³+45x² +600x, 0≤x≤ 20
The point of diminishing returns is. (Type an ordered pair.)

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