The master budget of Swifty Corporation shows that the planned activity level for next year is expected to be 50000 machine hours. At this level of activity, the following manufacturing overhead costs are expected: Indirect labor $630000 Machine supplies 90000 Indirect materials 120000 Depreciation on factory building 60000 Total manufacturing overhead $900000 A flexible budget for a level of activity of 60000 machine hours would show total manufacturing overhead costs of O $1020000. O S1080000. O $1068000. O S900000.