Jeffrey Inc.'s flexible budget for August, based upon actual output, called for the use of 10,50 pounds of materials at a standard cost of $7.40 per pound. The production department actually used 10,700 pounds of materials costing $7.10 per pound during August Jeffrey's materials price variance for August is: Bu O $3,150 favorable. O $3,150 unfavorable. $3,210 unfavorable. $3,210 favorable