Solve the problem.A breed of cattle needs at least 10 protein and 8 fat units per day. Feed type I provides 6 protein and 2 fat units at $4 per bag. Feed type II provides 2 protein and 3 fat units at $3 per bag. What mixture of Feed type I and Feed type II will fill the dietary needs at minimum cost?
A. 0 bags of Feed type I, 5 bags of Feed type II
B. 1 bag of Feed type I, 1 bag of Feed type II
C. 1 bag of Feed type I, 2 bags of Feed type II
D. 4 bags of Feed type I, 0 bags of Feed type II
Answer: C
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A. - 
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B. D = (-?, ?), R = (-?, ?)
C. D = (-?, ?), R = (-?, ?)
D. D = (-?, ?), R = (-?, ?)