Bramble 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 $16 per hour. In August, Bramble Co. purchased 11910 boards for a total cost of $122700. It used 11430 boards to manufacture 1980 boxes. Total labour hours were 1050 hours, and total labour costs were $16500. What was the labour quantity variance for August?