Sunland Co. produces wooden boxes. The company's standards per box require 7 boards, each costing $10 per board, and half of an hour of direct labour. The standard labour rate is $14 per hour. In August, Sunland Co. Purchased 12090 boards for a total cost of $122400. It used 11450 boards to manufacture 1850 boxes. Total labour hours were 1070 hours, and total labour costs were $16400. What was the total labour variance for August? O $1.33 F $1.33 U $3450 F 0 $3450 U