Please help me

Cadavieco Detailing's cost formula for its materials and supplies is $1,930 per month plus $12 per vehicle. For the month of November, the company planned for activity of 88 vehicles, but the actual level of activity was 53 vehicles. The actual materials and supplies for the month was $2.250. The activity vartance for materials and supplies in November would be closest to O $736 U O $420 F O $736 F O $420 U