Robb Industries Inc. (RII), developed standard costs for direct material and direct labour. In 2016, RII estimated the following standard costs for one of their major products, the 10-litre plastic container. Budgeted quantity Budgeted price Direct materials 0.10 kilograms $30 per kilogram Direct labour 0.05 hours $15 per hour During June 2017, RII produced and sold 5,000 containers using 490 kilograms of direct materials at an average actual cost per kilogram of $32 and 250 direct manufacturing labour-hours at an average actual wage of $15.25 per hour. June's direct manufacturing labour rate variance is Select one: a. $62.50 favourable b. $128.00 favourable. c. $62.50 unfavourable. d. neither favourable or unfavourable. e. $128.00 unfavourable.