TB MC Qu. 9.55 Petrus Framing's cost formula for its supplies. Petrus Framing's cost formula for its supplies cost is $1.930 per month plus 512 per frame. For the month of March, the company and torty 632 frames, but the actual level of activity was 641 trames. The actual supplies cost for the month was $2.040 The activity variance for test March would be closest to Mutible Choice 5444 5440 396 3960