Medford Tooling uses a standard cost system to account for the costs of its one product. Standards are 4 sheets of ½ inch steel at $110 per sheet and 14 hours of labor at a standard wage rate of $13. During July, Medford Tooling produced 600 units. Materials purchased and used totaled 2,540 sheets at a total cost of $268,850. Payroll totaled $112,930 for 8,770 hours worked. Calculate the following variances:
a. direct materials price variance
b. direct materials quantity variance
c. direct labor rate variance
d. direct labor efficiency variance