A school hires an entertainment company to host a party. The company charges
a setup fee of $75, plus $500 per hour. The same company pays 7 employees $20
per hour. Write a function that models the amount of money the company will
receive for hosting the party and another function that shows how much it will
cost the company to host the party. Combine the two functions to show the
amount of revenue the company will make for hosting the party. How much
money will the company make if the party lasts 5 hours?