1- B.3.B. Red Rose is a disease testing lab. Shown below are the standard costs for a typical test. Direct materials (2 test tubes @ $1.50 per tube) $ 3 Direct labor (1 hour @ $20 per hour) $ 20...

Extracted text: 1- B.3.B. Red Rose is a disease testing lab. Shown below are the standard costs for a typical test. Direct materials (2 test tubes @ $1.50 per tube) $ 3 Direct labor (1 hour @ $20 per hour) $ 20 Variable overhead (1 hour @ $6 per hour) $ 6 Fixed overhead (1 hour @ $12 per hour) $ 12 Total standard cost per test $ 41 The lab does not maintain an inventory of test tubes. Therefore, the tubes purchased each month are used that month. Actual activity for the month of January 2021, when 2,500 tests were conducted, resulted in the following. Direct materials (5,200 test tubes @ $1.60 per tube) $ 8,320 Direct labor (2,400 hours @ $21 per hour) $ 50,400 Variable overhead $ 14,800 Fixed overhead $ 31,000 Monthly budgeted fixed overhead is $ 24,000. (a) Compute the total, price and quantity variances for direct materials and direct labor and the total, controllable and volume variances for overhead. Show the calculations. (b) Make the closing entry for all variance accounts.