Acoma, Inc., has determined a standard direct materials cost per unit of $6.80 ( 2 feet $3.40 per foot). Last month, Acoma purchased and used 4,550 feet of direct materials for which it paid $15,015. The company produced and sold 2,170 units during the month. Calculate the direct materials price, quantity, and spending variances. (Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance). Round your intermediate calculations to 2 decimal places.)