TB MC Qu, 9-199 Courington Detailing's cost formula for its materials ... Courington Detaling's cos: formula for ts muterids and supples is 52,420 por month plus 59 per vehicle For the month of August, the company plamed for activity of 63 vehicles, But the aCluat level d activiy was 33 vehicles. The actual maperak and supplies for the month was 52,840 The activity variance for muteriels and supoles in August iould be clasest to 3230 $1470 5200