How do you determine flexible budget?

Copy s-% , ., conditional Format as BIu Number C D E F JKLM N O P QR S Performance Report For the Year Ended December 31 Partner in Charge: Vanessa Smith Flexible Master Actual results Variance Variance budget budget 4,900 0 4,900 (100)U 5,000 Billed hours Revenue Controllable variable costs: Direct labor Variable overhead (137,200) (34,300) (120,000) (40,000) Contribution margin Controllable fixed costs: Rent Other administrative ?(30,000) 30,000) expenses (45,000) Branch operating income Actual Flexible Master ROI Residual Income