The standards for one case of liquid weed killer are as follows Direct materials Direct labor Variable overhead (based on machine hours) 5 lb @S 6.80/b 2.4 hr @$14.00/hr 1.5 hr @$ 4.50/hr During the week ended May 6, the following activity took place: 2,910 machine hours were worked 11,400 lb of raw material were purchased for inventory at a total cost of $80,940. 1,900 cases of finished product were produced. 9,260 lb of raw material were used 4,420 labor hours were worked at an average rate of $14.35 per hour $12,513 actual variable overhead costs were incurred. Required: Calculate each of the following variances. (Do not round intermediate calculations. Indicate the effect of eac a. Price variance for raw materials purchased b Raw materials usage variance c. Direct labor rate variance d. Direct labor efficiency variance e. Variable overhead spending variance f Variable overhead efficiency variance