Wexell Framing's cost formula for its supplies cost is $1,230 per month plus $10 per frame. For the month of October, the company planned for activity of 592 frames, but the actual level of activity was 597 frames. The actual supplies cost for the month was $7,050. The activity variance for supplies cost in October would be closest to: O $100 O s50U O $100 O $50 F