Ruby Company produces a chair for which the standard specifles 4 yards of material per unit. The standard price of one yard of materlal is sa. 60 . During the month, 4,600 chairs were manufactured, using 18,800 yards at a cost of 58 .cs per yard. Determine the followingt Enter favorable variances as negative numbers. a. Direct materials price variance 1 b. Direct materials quantity variance 1 c. Total direct materlals cost variance 1