8 C-town brewery brews two beers: Expansion Draft and Buming River. Expansion draft sells for $20 per barrel while Burning River sells for $8 per barrel. Producing a barrel of Expansion Draft takes 8 pounds of com and 4 pounds of hops. Producing a barrel of Buming River requires 2 pounds of com, 6 pounds of rice, and 3 pounds of hops. The brewery has 500 pounds of com, 300 pounds of rice, and 400 pounds of hops. Assume a linear relationship, use Excel solver to determine the optimal mix of Expansion Draft and Buming River that maximizes C-town's revenue.