Ruff 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 212 grams of protein and at least 172 grams of fat. If chicken costs 11€ per ounce and grain costs 1€ per ounce, how many ounces of each should Ruff use in each bag of dog food to minimize costs?

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