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Bob owns a watch repair shop. He has found that the cost of operating his shop is given by Co- 29+79, where x is

Bob owns a watch repair shop. He has found that the cost of operating his shop is given by Co- 29+79, where x is the number of watches repaired. How many watches should he repair to produce the lowest cost? O316 watches 037 watches O 148 watches O 79 watches

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