B.3.3. Red Rose is a disease testing lab. Shown below are the standard costs for a typical test. $3 $ 20 Direct materials (2 test tubes @ $1.50 per tube) Direct labor (1 hour @ $20 per hour) Variable overhead (1 hour @ $6 per hour) Fixed overhead (1 hour @ $12 per hour) Total standard cost per test $ 6 $ 12 $ 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. $ 8,320 $ 50,400 Direct materials (5,200 test tubes @ $1.60 per tube) Direct labor (2,400 hours @ $21 per hour) Variable overhead Fixed overhead $ 14,800 $ 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