Cullumber provides shuttle service between four hotels near a medical center and an international airport. Cullumber uses two 10- passenger vans to offer 12 round trips per day. A recent month's activity in the form of a cost-volume-profit income statement is shown below. Sales (1,460 passengers) $33,580 Variable costs Fuel $5,453 Tolls and parking 2,011 Maintenance 931 8,395 Contribution margin 25,185 Fixed costs Salaries 13.000 Depreciation 3,000 Insurance 1,250 17.250 Net income $7,935