Watsica LLC's cost formula for its vehicle operating cost is $3,000 per month plus $330 per snow-day. For the month of December, the company planned for activity of 21 snow-days, but the actual level of activity was 26 snow-days. The actual vehicle operating cost for the month was $11,050. The spending variance for vehicle operating cost in December would be closest to: $530U $1120F $530F $1120U