At the beginning of the year, S. Company had the following standard cost sheet for one of its plastic products: Direct materials (3 kilograms @ @10) $30 Direct labour (2 hours @$18) 36 Standard prime cost per unit $66 The actual results for the year as follows: a units produced: 350 000 b Materials purchased: 930 000 kilograms @$10.10 C Materials used: 930 000 kilograms d Direct labour: 725 000 hours@ 17.85. Required: 1 Compute price and usage variance for materials. 2 Compute the labour rate and labour efficiency variances