The following labor standards have been established for a particular product: Standard labor-hours per unit of output: 1.5 hours Standard labor rate: $17.55 per hour The following data pertain to operations concerning the product for the last month: Actual hours worked : 5,300 hours Actual total labor cost: $94,340 Actual output 3,600 units What is the labor rate variance for the month? a. $1,325 U b. $1,780 F c. $430 F d. $430 U