Crane Co. produces wooden boxes. The company's standards per box require 5 boards, each costing $9 per board, and half of an hour of direct labour. The standard labour rate is $14 per hour. In August, Crane Co. purchased 11900 boards for a total cost of $122000. It used 11400 boards to manufacture 1800 boxes. Total labour hours were 900 hours, and total labour costs were $16000. What was the total labour variance for August? $1.40 F O $1.40 U $3400 F O $3400 U