Ruby Company produces a chair that requires 7 yards of material per unit. The standard price of one yard of material is $10.10. During the month, 6,900 chairs were manufactured, using 49,300 yards at a cost of $10.71 per yard. Enter favorable variances as negative numbers. (a) Determine the price variance. Unfavorable w (b) Determine the quantity variance. w (c) Determine the cost variance