Subatomic Shirts' standard cost per t-shirt included 0.20 direct labour hours per shirt at $16.00 per hour. Subatomic Shirts actually used 10,350 direct labour hours at a cost of $15.80 per hour to produce 50,000 t-shirts. a) Calculate the direct labour rate variance: $ b) Is the direct labour rate variance favourable or unfavourable? c) Calculate the direct labour efficiency variance: $ d) Is the direct labour efficiency variance favourable or unfavourable? e)Calculate the total direct labour variance: $ f Is the total direct labour variance favourable or unfavourable