Kuczenski Corporation's cost formula for its manufacturing overhead is $45,700 per month plus $53 per machine-hour. For the month of March, the company planned for activity of 6,200 machine-hours, but the actual level of activity was 6,150 machine-hours. The actual manufacturing overhead for the month was $373,630. 3. The manufacturing overhead in the planning budget for March would be closest to: $376,668 $374,300 $373,630 $371,650 4. The manufacturing overhead in the flexible budget for March would be closest to: $371,281 $371,650 $374,300 $373,630 5. The activity variance for manufacturing overhead in March would be closest to: $670 U $670 F $2,650 U $2,650 F 6. The spending variance for manufacturing overhead in March would be closest to: $1,980 U $670 U $1,980 F $670 F