Olivier Framing's cost formula for its supplies cost is $2,970 per month plus $17 per frame. For the month of January, the company planned for activity of 536 frames, but the actual level of activity was 537 frames. The actual supplies cost for the month was $11,751. The spending variance for supplies cost in January would be closest to: $331 F $348 U $348 F $331 U PLEASE EXPLAIN Solution