Dubberly Corporation's cost formula for its manufacturing overhead is $30.800 per month plus 562 per machine-hour. For the month of March, the company planned for activity of 7940 machine hours, but the actual level of activity was 7,900 machine-hours. The actual manufacturing overhead for the month was $545 730 The activity variance for manufacturing overhead in March would be closest to Multiple Choice O 22850 522.650 F 52.480 F