MC Qu. 159 Cadavieco Detailing s cost formula for ... Larance Detailing's cost formula for its materials and supplies is $2,050 per month plus $11 per vehicle. For the month of November, the company planned for activity of 85 vehicles, but the actual level of activity was 45 vehicles. The actual materials and supplies for the month was $2,880. The spending variance for materials and supplies in November would be closest to: