Ruby Company produces a chair for which the standard specifies 3 yards of material per unit. The standard price of one yard of material is $9.60. During the month, 5,900 chairs were manufactured, using 17,900 yards at a cost of $10.08 per yard. Determine the following: Enter favorable variances as negative numbers. a. Direct materials price variance \$ b. Direct materials quantity variance $ c. Total direct materials cost variance $