Ohme Framing's cost formula for its supplies cost is $1,620 per month plus $13 per frame. For the month of April, the company planned for activity of 882 frames, but the actual level of activity was 878 frames. The actual supplies cost for the month was $13,500. The supplies cost in the flexible budget for April would be closest to O $13.500 O $13.086 $13027 $13.034