10) Healthy Environs Company provides cleaning services for residential and commercial customers. Following are data for the month of June:

	Residential	Commercial	Total
Number of customers	600	400	1,000
Service revenue	$ 48,000	$ 40,000	$88,000
Variable costs	14,000	22,000	36,000
Contribution margin	34,000	18,000	52,000
Fixed costs			41,000
Operating income			$11,000

For each type of customer, determine both the contribution margin per customer and the contribution margin ratio. What type of service is more profitable?