J.C penny sells an item for $9 each if the number of item purchased are less than 23 and for $3.40 each if the number of items purchased are 23 or more. Write the cost function (C) for the purchase of X number of items
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Let's say you purchased less than 23 items. If it costs you $3.40 per item, and x is the number of items, what is the cost?
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