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The carmike cinema offers three combo choices: small, medium, and large. The small combo offers 4.5 cups of popcorn and a large drink at 6.50. The medium combo offers 5.5 cups of popcorn and a large drink at 8.00. The large combo offers 6.5 cups of popcorn and a large drink at 9.50. What is the unit rate (price per cup)?