Ruby Cempany produces a chair that requires a standard 7 yacds of materai per unit. The standard price of one yard of material is 513.60 , During the month, 5,200 chuirs vere manufactured, using 35,700 yards at a cost of 114.42 per yard. Determine the (a) direct materias price varlance, (b) direct materials quantity variance, and (c) total direct materiais cost variance. Enger favorabie vanances as negative mumters