78. An oil company produces gasoline from five inputs. The cost, density, viscosity, and sulfur content, and the number of barrels available of each input are listed in the file P04 78.xlsx. Gasoline sells for $75 per barrel. Gasoline can have a density of at most 0.95 units per barrel, a viscosity of at most 35 units per barrel, and a sulfur content of at most 3.3 units per barrel. a. How can the company maximize its profit?