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To reduce inventory,a department store charges three rates.If you buy 0-5 pairs of socks,the price is $3.50 per pair of socks.If you buy 6-10 pairs of socks,the price is $3.00 per pair.If you buy more than 10,the price is $2.75 per pair.Graph the compound function that represents the cost of buying N pairs of socks.
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