13. You have three types of ground coffee: cheap ($5/pound), medium ($8/pound), and expensive Arabica ($14/pound). You want to make a blend that costs $10/pound, and you want to make 50 pounds of it. You also want to be able to say "contains at least 20% Arabica" without lying. Determine how much of each type of coffee you should use. (Hint: there is more than one possible correct answer.)

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