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