- Giannitti Corporation bases its predetermined overhead rate on the estimated machine-hours for the upcoming year. Data for the upcoming year appear below: Estimated machine-hours Estimated variable manufacturing overhead Estimated total fixed manufacturing overhead 72,200 3.40 per machine-hour $838, 780 The predetermined overhead rate for the recently completed year was closest to: Multiple Choice O $10.20 per machine-hour O $6.66 per machine-hour O $8.61 per machine-hour $15.02 per machine-hour O