Kim Airedale, a manager of Wagers, Inc., was reviewing the water bills of a dog daycare and spa. She determined that its highest and lowest bills of $3,600 and $2,800 were incurred in the months of May and November, respectively. If 500 dogs were washed in May and 200 dogs were washed in November, what was the variable cost per dog associated with the company’s water bill?

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