22 8 02:01:44 The following information summarizes the standard cost for producing one metal tennis racket frame at Spaulding Industries. In addition, the variances for one month's production are given. Assume that all inventory accounts have zero balances at the beginning of the month. Standard Cost Per Standard Monthly Unit Costs Materials $ 5.00 $16,800 Direct Labor 3 hrs @ $2.00 6.00 14,400 Factory Overhead: Variable Fixed 2.00 4,800 5.00 $20.00 12,000 $48,000 Variances: Material price Material quantity Labor rate Labor efficiency $ 451.00 unfavorable $ 320.00 unfavorable $ 570.00 favorable $2,250.00 unfavorable What was the actual quantity of materials used during the month?