Swifty Co. produces wooden boxes. The company's standards per box require 6 boards, each costing $11 per board, and half of an hour of direct labour. The standard labour rate is $14 per hour. In August, Swifty Co. purchased 12020 boards for a total cost of $123000. It used 11510 boards to manufacture 1880 boxes. Total labour hours were 1050 hours, and total labour costs were $16350. What was the labour quantity variance for August? 0 $13390U O $1540F O $13390F O $154ou