All Concord Corporation produces a product requiring $4$ pounds of material with a standard cost of $$3\mathrm{.}00$ per pound. During December, All Concord purchased $7800$ pounds of material for $$22776$ and used the material to produce $800$ products. What was the materials price variance for December?

$$1150F$

$$624F$

$$4726U$

$$3576U$