Mom$$s Apple Pie Company uses a standard cost system. The standard direct labor time for each pie is $20$ minutes. During the most recent month, the company produced and sold $4,500$ pies. The standard direct labor rate is $$27\mathrm{.}00$ per hour; the actual labor rate per hour for the month was $$27\mathrm{.}50.$ The company used a total of $1,490$ labor hours. What was the direct labor efficiency variance for the month? Was this variance favorable $($F$)$ or unfavorable $($U$)?($Do not round intermediate calculations.$)$