I'm not even sure if anything is right.

Ruby Company produces a chair that requires 5 yards of material per unit. The standard price of one yard of material is $13.60. During the month, 6,500 chairs were manufactured, using 31,900 yards at a cost of $12.78 per yard. Enter favorable variances as negative numbers. (a) Determine the price variance. Unfavorable (b) Determine the quantity variance. Favorable Unfavorable (c) Determine the cost variance