Gaermont Oils must schedule two mixing processes. When process 1 is carried out for one hour, 80 barrels of national oil and 220 barrels of imported oil are consumed. Similarly, when the 2 process is carried out for one hour, 120 barrels of national oil and 180 barrels of imported oil are consumed. With respect to production, process 1 generates 4000 gallons of gasoline and 1750 gallons of diesel per hour of operation. Process 2 generates 3,500 gallons of gasoline and 2,250 gallons of diesel per hour. For the next production run, 12,000 barrels of national oil and 18,000 barrels of imported oil are available. Sales contracts require that a minimum of 280,000 gallons of gasoline and 120,000 gallons of diesel be manufactured. On the other hand, the energy secretariat has issued an opinion that limits total diesel production to a maximum of 60% of the gasoline produced. Create a linear programming model to determine the production schedule that maximizes the total contribution.