The cost of operating the quality control department of Ames Manufacturing includes $608,000 of ...

The cost of operating the quality control department of Ames Manufacturing includes $608,000 of fixed costs and $400,000 of variable costs. The department normally budgets 21,000 inspection hours a year. Two departments receive quality control checks, fabrication and assembly. Fabrication is budgeted at 12,000 hours a year, while assembly is budgeted the remainder.

Required:
a.   In July, fabrication used 1,000 inspection hours and assembly used 800 hours. How much did each department receive in quality control costs assuming a single-rate is used based on budgeted hours?
b.   In August, fabrication used 1,200 inspection hours and assembly used 900 hours. How much did each department receive in quality control costs assuming a dual-rate is used with budgeted usage for fixed costs and actual usage for variable costs?
c.   Which method seems more appropriate in this case? Explain.