Concord Company has a materials price standard of $2.60 per kilogram. 4040 kilograms of materials were purchased at $2.20 a kilogram. The actual quantity of materials used was 3560 kilograms, although the standard quantity allowed for the output was 3360 kilograms. Concord Company's materials quantity variance is

$1344 F.

$520 F.

$520 U.

$1344 U.