I need help on 3 and 4. I did 4 but I don't know if I am right

3. Ruby Company produces a chair that requires 5 yds. of material per unit. The standard price of one yard of 9 50. During the month, 8,500 chairs were manufactured, using 43,600 yards at a cost of $7.55 per yard. Determine the (a) price variance, (b) quantity variance, and (c) cost variance. 4. Japan Company produces lamps that require 2.25 standard hours per unit at an hourly rate of $15.00 per hour. If 7,700 units required 19,250 hours at an hourly rate of $14.90 per hour, what is the direct labor (a) rate variance, (b) time variance, and (c) cost variance? o