Dont know where to start and how to tackle this question

Diedmont Company segments its business into two regionsNorth and South. The company prepared the contribution format segmented income statement as shown: Total Company North South Sales $ 812,500 $ 650,000 $ 162,500 Variable expenses 552,500 520,000 32,500 Contribution margin 260,000 130,000 130,000 Traceable fixed expenses 134,000 67,000 67,000 Segment margin 126,000 $ 63,000 $ 53.000 Common fixed expenses 54,000 Net operating income $ 72,000 Required: I. Compute the companywide break-even point in dollar sales. 2. Compute the break-even point in dollar sales for the North region. 3. Compute the break-even point in dollar sales for the South region