Marigold Corp. has a materials price standard of $$3$ per pound. $4000$ pounds of materials were purchased at $$3\mathrm{.}20$ a pound. The actual quantity of materials used was $4000$ pounds while the standard quantity allowed for the output was $3500$ pounds.

Marigold Corp.$\text{'}$s materials quantity variance is

$$1600U.$

$$1500U.$

$$1500F.$

$$1600F.$