Tasty Bakery sells three kinds of muffins: chocolate chip muffins at 40 cents each, oatmeal muffins at 45 cents each, and cranberry muffins at 50 cents each. Charles buys some of each kind. He chooses 7 oatmeal muffins and three times as many cranberry muffins as chocolate chip muffins. If he spends $8.85 on 19 muffins, how many chocolate chip muffins did he buy?
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