Mondo Snow Removal's cost formula for its vehicle operating cost is $1,620 per month plus $465 per snow-day. For the month of January, the company planned for activity of 15 snow-days, but the actual level of activity was 20 snow-days. The actual vehicle operating cost for the month was $10,400. The activity variance for vehicle operating cost in January would be closest to: $1,805U $1,805F $2,3250 $2,325F