You are hired as a consultant for a local restaurant. It is considering whether to close at 9:00 p. m., stay open an extra hour (10:00 p. m.), or close earlier (8:00 p. m.). Based on wages and utility bills, the added cost (the marginal cost) of staying open for each additional hour is $387.

a) If the additional revenue (the marginal revenue) during the last hour is $447, the profit earned during the last hour of operation will be $ nothing.

b) If the additional revenue during the last hour is $307, the profit earned during the last hour of operation will be $ nothing.

c) If the additional revenue (the marginal revenue) from staying open until 10.00 p. m. is $387, the profit earned during the last hour of operation will be $ nothing.