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Marvel Parts Inc. (MPI) manufactures auto-accessories. One of the company's products is a seat cover for a car. The company has a standard cost system for all of its products. According to the standards that have been set, factory employees should work 2,850 hours each month to produce 1,900 seat covers. The standard cost card for their seat cover product is as follows: STANDARD COST CARD Total (1,900 Seat Covers) Per Seat Cover Direct Materials (5.6 yards of material per unit) $42,560 $22.40 Direct Labour (1.5 hours per unit, $12 rate per hour) $34,200 $18.00 Variable Manufacturing Overhead $6,840 $3.60 Total Product Cost per Unit $44.00 During the month of August, factory employees worked 2,800 direct labour hours for a total direct labour cost of $37,800. To produce 2,000 seat covers in August, MPI purchased and used 12,000 yards of material at $3.80 per yard for a total cost of $45,600. Required: a. Calculate the materials price and quantity variances. b. Calculate the labour rate and efficiency variances. C. State one potential explanation to justify the materials quantity variance