Help Save&Exit TB MC Qu. 9-55 Petrus Framing's cost formula for its supplies... Petrus Framing's cost formula for its supplies cost is $1,840 per month plus $12 per frame. For the month of March, the company planned for activity of 624 frames, but the actual level of activity was 631 frames. The actual suppliles cost for the month was $9,650. The activity varlance for supples cost in March would be closest to: Multiple Choice $322 U $84 U $84 F #: Ned? Prev1 of 10