Concord 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, Concord Co. purchased 11970 boards for a total cost of $123000. It used 11590 boards to manufacture 1970 boxes. Total labour hours were 970 hours and total labour costs were 516500. What was the total labour variance for August? $1.00F $1.00U $2710F $2710U