What is the value of the objective function maximizing the revenue?

You are in the business of baking bread and cake. A loaf of bread is sold for $2 and a cake for $3. Bread takes 5 minutes and cake takes 4 minutes to prepare. One loaf of bread uses 0.15 pounds of flour and one cake uses 0.6 pounds. You have 6 2/3 hours of labor and 43.2 pounds of flour.