What was the meaning of the comma in your input? W|A interpreted it as a separator of a 2-vector. I wonder if this is what you really meant:
Plot3D[(472.5 + x)*(101.8 + y), {x, 0, 500}, {y, 0, 20}]
ContourPlot[(472.5 + x)*(101.8 + y), {x, 0, 500}, {y, 0, 20}]