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

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 Peru it: $2.80

Direct Labor:

Standard: 0.90 hours at $16/hr / Actual: 0.95 hours at $15.40/hr / standard cost per unit: $14.40 / Actual cost per unit: $14.63

Variable overhead:

Standard: 0.90 hours at $5.60/hr / Actual: 0.95 hours at $5.00/hr / Standard cost per unit: $5.04 / Actual cost per unit: $4.75

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

The actual production for the month was 10,500 units. Variable overhead cost is assigned to products on the basis of direct labor hours. There are no beginning or ending inventories of materials.

1) Compute the following variances fir May:

a) materials and quantity variances

b) labor rate and efficiency variances

c) variable overhead rate and efficiency variances

2) how much of the $.58 excess unit cost is traceable to each of the variances computed in (1) above?

3) how much of the $.58 excess unit cost is traceable to apparent inefficient use of labor time?