10-4A. Materials, Labor, and Variable Overhead Variances The following summarized manufacturing data relate to Steffan Corporation's April operations, during which 2,000 finished units of product were produced. Normal monthly capacity is 1,100 direct labor hours. Assume that the 4,200lb. of materials purchased were all used in producing the 2,000 completed units. Determine the materials price and efficiency variances, labor rate and efficiency variances, and variable overhead spending and efficiency variances