The following labor standards have been established for a particular product: Standard labor-hours per unit of output ....... 4.0 hours Standard labor rate ..... $12.30 per hour The following data pertain to operations concerning the product for the last month: Actual hours worked ........ 7,100 hours Actual total labor cost ...... $89,105 Actual output. 1,500 units What is the labor time variance for the month? $15,305 F O $13,530 U $15,305 U O $13,805 U