Barrington Bears has developed the following sales forecasts for the next few months. January 500 , February 600 , March 720 . April 800 and May 770. BB has 80 bears on hand on Dec. 31 . Normal ending inventory policy is to hold 20% of next month's sales. Each bear needs 0.8 yards of fabric and two pounds of stuffing. Fabric is budgeted to cost $15 per yard and stuffing $4 per pound. Direct labor is paid $18 per hour. Each bear takes 40 minutes to hand-finish. Variable overhead totals $21 per direct labor hour. Fixed overhead amounts to $25,000 per month. Eighty yards of fabric and 100 pounds of stuffing were in stock at year-end. Ten percent and 25% of next month's stuffing and fabric needs respectively are planned for raw materials ending inventory each month. Assume that in March there was a favorable variance from the production master budget. Which factors may not have contributed to this result