what is the answer?

Submit 7 Petrus Framing's cost formula for its supplies cost is $2,300 per month plus $6 per frame. For the month of March, the company planned for activity of March would be closest to: 861 frames, but the actual level of activity was 856 frames. The actual supplies cost for the month was $7,790. The activity variance for supplies cost in 00:28:03 Multiple Choice O $30 U O $324 U O $324 F $30 F