Longview Hospital performs blood tests in its laboratory. The following standards have been set for each blood test performed:

During May, the laboratory performed 1,500 blood tests. On May 1 there were no direct materials (plates) on hand; after a plate is used for a blood test it is discarded. Variable overhead is assigned to blood tests on the basis of standard direct labor-hours. The following events occurred during May
• 3,600 plates were purchased for $9,540
• 3,200 plates were used for blood tests
• 340 actual direct labor-hours were worked at a cost of $5,550
The direct materials purchases variance is computed when the materials are purchased.
The labor rate variance for May is

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Standard Price or Rate $2.75 per plate $15.00 per hour $7.00 per hour Standard Quantity or Hours 2.0 plates 0.2 hours 0.2 hours Direct materials... labor. . Variable overhead..