To paint a house, a painting company charges a flat rate of $500 for supplies, plus $50 for each hour of labor. Find the slope of the line, What is the meaning of the slope in this context?

A. The slope of the line is 500. The painter gets 500 dollars per hour they work.

B. The slope of the line is 50. The painter works 50 hours for every dollar.

C. The slope of the line is 50. The painter gets 50 dollars per hour they work.

D. There is no slope.