Costs and activity levels over the past three months are as follows for the Mixing Department of the Ballou Company:

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December January February Activity center total costs $20,000 $30,000 $40,000 Labor hours 1,000 1,000 1,000 Machine hours 3,000 4,500 6,000 Pounds of materials used 10,000 12,000 14,000 Units produced. 120,000 130,000 140,000 Required: Which activity measure would appear to be the best cost driver for this cost center? Comment.