Ruby Company produces a chait for which the standard specifies 7 yards of material per unit. The standard price of one yard of material is $14.60. During the month, 8,300 chairs were manufactured using 59,300 yards at a cost of $15:48 per yard Determine the following: Enter favorable variances as negative numbers, a. Direct materials price variance b. Direct materiais quantity variance Favorable Unfavorable c. Total direct materials cost variance