Bus Econ 12.2.33 Question Help 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 of dollars). R(x) = 10,000 - x+ 36x + 600x, OSxs 20 The point of diminishing returns is . (Type an ordered pair.)