Cinturon Corporation produces high-quality leather belts. The company's plant In Boise uses a standard costing system and has set the following standards for materials and labor: During the first month of the year, Boise plant produced 92,000 belts. Actual leather purchased was 287, 500 strips at $3.60 per strip. There were no beginning or ending Inventories of leather. Actual direct labor was 78, 200 hours at $12.50 per hour. Break down the total variance for labor Into a rate variance and an efficiency variance using the columnar and formula approaches