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Use the following data for questions 13 thru 17 : XYZ Engineering performs cement core tests in its laboratory. The following standards have been set for each core test performed: During March, the laboratory performed 2,000 core tests. On March 1 no direct materials (sand) were on hand. Variable manufacturing overhead is assigned to core tests on the basis of standard direct labor-bours. The following events occurred during March: - 7,200 pounds of sand were purchased at a cost of 56,120 . - 7,200 pounds of sand were used for core tests. - 840 actual direct labor-hours were worked at a cost of $8,610. - Actual variable manufacturing overhead incurred was \$7,240. The materials price variance for March is: $720 unfavorable $720 favorable $281 unfavorable \$281 favorable The materials quantity variance for March is $900 favorable $1,950 favorable $1,950 unfavorable $900 unfavorable Question 15 The labor rate variance for March is: $4,578 unfavorable $1,470 unfavorable $4,578 favorable \$ $1,470 favorable The labor efficiency variance for March is: $480 favorable $480 unfavorable $192 favorable $192 unfavorable Question 17 The variable rate manufacturing overhead variance for March is: $320 unfavorable $320 favorable $40 unfavorable $40 favorable