Ruff, Inc. makes dog food out of chicken and grain. Chicken has 10 grams of protein and 5 grams of fat per ounce, and grain has 2 grams of protein and 2 grams of fat per ounce. A bag of dog food must contain at least 720 grams of protein and at least 370 grams of fat. If chicken costs 10 cents per ounce and grain costs 1 cent per ounce, how many ounces of each should Ruff use in each bag of dog food in order to minimize cost?
?
A. 0 ounces of chicken and 360 ounces of grain
B. 70 ounces of chicken and 0 ounces of grain
C. 70 ounces of chicken and 10 ounces of grain
D. 74 ounces of chicken and 0 ounces of grain
E. no solution
Answer: A
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