Dubberly Corporation's cost formula for its manufacturing overhead is $31,900 per month plus $65 per machine-hour. For the month of March, the company planned for activity of 8,160 machine-hours, but the actual level of activity was 8,010 machine-hours. The actual manufacturing overhead for the month was $586,27O The activity variance for manufacturing overhead in March would be closest to: Multiple Choice $23,970 U 23,970 F $9750 F $9,750 U