Alberta Manufacturing Company manufactures a single product. The standard cost of one unit of this product is: Direct Materials: 6 metres at $1.50 $9.00 Direct Labour: 1 hour at $6.75 $6.75 Variable Overhead: 1 hour at $4.50 $4.50 Total Standard Variable Cost per Unit $20.25 During the month of October, 6,000 units were produced. Selected cost data relating to the month's production follow: Materials Purcahsed: 60,000 metres at $1.43 $85,800 Material Used in Production: 38,000 metres Direct Labour: _? hours at $ _? per hr $41,925 Variable Overhead Cost Incurred $30,713 Variable Overhead Efficiency Variance $2,250 unfavourable There was no beginning inventory of raw materials. The variable overhead rate is based on direct labor-hours. Required: a) Compute direct materials price and quantity variances. b) Compute direct labor rate and efficiency variances c) Compute variable overhead spending variance for the month, and prove the efficiency variance given above is currect