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Ruby Company produces a chair for which the standard specifies 5 yards of material per unit. The standard price of one yard-of material is 37.50. During the month, 8,500 chairs were manufactured, usin0 43,600 yards at a cost of $7.55 per yard. Detemmine the following: Enter favorable variances as negative number.5. a. Direct-materials price variance b. Direct materials quantity variance c. Total direct materials cost variance