The following labor standards have been established for a particular product:

Standard labor-hours per unit of output	8.4	hours
Standard labor rate	$ 15.70	per hour

The following data pertain to operations concerning the product for the last month:

Actual hours worked	10,500	hours
Actual total labor cost	$ 162,330
Actual output	1,400	units

What is the labor rate variance for the month?

$336 F

$2,520 F

$2,520 U

$336 U