Hi-Tek Labs performs steroid testing services for colleges and universities. Because the company works only with educational institutions, the price of each test is strictly regulated. Therefore, the costs incurred must be carefully monitored and controlled. Shown below are the standard costs for a typical test:

The lab does not maintain an inventory of Petri dishes. Therefore, the dishes purchased each month are used that month. Actual activity for the month of May 2016, when 2,500 tests were conducted, resulted in the following:
Direct materials (2,530 dishes)..............................$5,060
Direct labour (1,240 hours)...................................26,040
Variable overhead.............................................10,100
Fixed overhead..................................................5,700
Monthly budgeted fixed overhead is $6,000. Revenues for the month were $55,000, and selling and administrative expenses were $2,000.
Instructions
(a) Calculate the price and quantity variances for direct materials and direct labour.
(b) Calculate the total overhead variance.
(c) Prepare an income statement for management.
(d) Provide possible explanations for each unfavourable variance.

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Direct materials (1 Petri dish at $1.80 per dish) Direct labour (0.5 hours at $20.50 per hour) Variable overhead (0.5 hours at $8 per hour) Fixed overhead (0.5 hours at $5 per hour) Total standard cost per test $1.80 10.25 4.00 2.50 $18.55