Please explain the formulas?? Thank you

Countywide Cable Services, Inc. is organized with three segments: Metro, Suburban, and Outlying. Data for these segments for the year just ended follow. Service revenue Variable expenses Controllable fixed expenses Fixed expenses controllable by others Metro $1,010,000 162,000 368,000 192,000 Suburban $810,000 112,000 288,000 162,000 Outlying $410,000 62,000 118,000 52,000 In addition to the expenses listed above, the company has $75,000 of common fixed expenses. Income-tax expense for the year is $275,000. Required: 1. Prepare a segmented income statement for Countywide Cable Services, Inc. SEGMENTED INCOME STATEMENTS: COUNTYWIDE CABLE SERVICES, INC. Segments of Company Countywide Cable Metro Suburban Outlying Services Segment contribution margin Profit margin controllable by segment manager Profit margin traceable to segment