Chapter 18, Problem 18.43P

Physical units, inspection at various stages of completion. Chemet manufactures chemicals in a continuous process. The company combines various materials in a specially configured machine at the beginning of the process, and conversion is considered uniform through the period. Occasionally, the chemical reactions among the materials do not work as expected and the output is then considered spoiled. Normal spoilage is 4% of the good units that pass inspection. The following information pertains to March 2017:

Beginning inventory	2,500 units (100% complete for materials; 25% complete for conversion costs)
Units started	30,000
Units in ending work in process	2,100(100% complete for materials; 70% complete for conversion costs)
Chemet had 1,900 spoiled units in March 2017.

Required

Using the format on page 728, compute the normal and abnormal spoilage in units, assuming the inspection point is at (a) the 20% stage of completion, (b) the 45% stage of completion, and (c) the 100% stage of completion.