Material, Labor, and Variable Overhead Variances The following summarized maruaacturing data relate to Stelfan Corponation's Aprit operations, during which 2,000 finished units of procuct were produced. Normal monthly capac is is t, 100 direc taber hours. Asume that the A,200 lo of materials purchased were all used in producing the 2,000 completed unts. Determine the materiais price and efficiency variankes, laber rate and afficiency varancez. and yariatle overhead spendinc and efficiency variances. Assume that the 4,200 ib. of materials purchased were all used in producing the z,000 completed units. Derermine the materials price and efficiency variances, isbor rate and efficiency variances. and variable ovemead rpending and efficiency variances