Jessica Kirst is the new owner of Coffee Country Roasters. They roast and blend coffee to sell on the internet. Their best sellers are "Best Blend" and "Economy Blend" coffee. Both are blended from three basic grades of coffee: Best blend: 50% grade A, 20% grade B, and 30% grade C Economy: 20% grade A, 50% grade B, and 30% grade C The firm is given the option of buying up to 100 tons of grade A, 100 tons of grade B, and 75 tons of grade C. The profit on the Best Blend is $150 per ton and the profit on the Economy Blend is $120 per ton