Colise Services is a repair-service company specializing in small household jobs. Each client pays a fixed monthly service fee based on the number of rooms in the house. Records are kept on the time and material costs used for each repair. The following profitability data apply to five customers:

	Customer Revenues	Customer Costs
Marveline Burnett	$360	$270
J Jackson	$240	$366
Roger Jones	$96	$90
Paul Saas	$90	$132
Becky Stephan	$420	$264

a. Compute the operating income for each of the five customers.

b. What options should Colise Services consider in light of the customer-profitability results?

c. What problems might Colise Services encounter in accurately estimating the operating costs of each customer?