Koontz Company manufactures a number of products. The standards relating to one of these products are shown below along with actual cost data for May:

Direct Materials: Standard: 1.80 feet at $1.20/ft Actual: 1.75 feet at $1.60/ft Standard cost per unit: $2.16. Actual cost per unit: $2.80

Direct Labor: Standard: .90 hours at $16.00/hr. Actual: .95 hours at $15.40/hour. Standard cost per unit: $14.40. Actual cost per unit: $14.63

Variable Overhead: Standard: .90 hours at $5.60/hour. Actual: .95 hours at $5.00/hour Standard cost per unit: $5.04 Actual cost per unit: $4.75

Excess of actual cost over standard cost per unit: $0.58

Actual production for the month was 10,500 units. Variance overhead cost is assigned to products on the basis of direct-labor hours. There were no beginning or ending inventory of materials.

1) Compute the following variances for May:

a) materials price and quantity variances

b) labor rate and efficiency variances

2) how much of the $0.58 excess unit cost is traceable to each of the variances computed in Q 1 above

3) how much of the $0.58 excess unit cost is traceable to apparent inefficient use of labor time?