Paradise Corporation has determined a standard labor cost per unit of $23 ( 0.50 hours $46 per hour). Last month, Paradise incurred 972 direct labor hours, for which it paid $25,515. The company produced and sold 2,500 units during the month. Required: Calculate the direct labor rate, efficiency, and spending variances. Note: 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