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EX 7-18 Variable costing income statement for a service company The actual and planned data for Underwater University for the Fall term were as follows: Obj. 5 Registration, records, and marketing costs vary by the number of enrolled students, while instructional costs vary by the number of credit hours. Depreciation is a fixed cost. Prepare a variable costing income statement showing the contribution margin and operating income for the Fall term. Answers are entered in the cells with gray backgrounds. Cells with non-gray backgrounds are protected and cannot be edited. An asterisk (") will appear to the right of an incorrect entry. Complete Ex 7-18, "Variable costing income statement for a service compurny for Underwater University ont Fage 339 of your textbook Upload your Excel file usirg the following narning protocot: Lastrame FirstnameEx7-18 Note: You will need to downlond the attached Excel sheet to complete the assignment and then upload the cormpleted income statement for credit