Ex. 18–21 (FINMAN); Ex. 3–21 (MAN)
The solution to this exercise is to determine if the cost per pound trends in paper
stock, conversion, and coating costs are remaining stable over time. The
following table can be developed from the data:
a. January February March April May June
Paper stock
($ ÷ pounds output) $0.70 $0.70 $0.70 $0.70 $0.70 $0.70
Coating
b. Operator 1 believes that energy consumption is becoming less efficient. The
energy cost is part of the conversion cost. The conversion cost per output
remaining stable.
Operator 3 is concerned about coating costs. The coating cost per output
pound is increasing over time. Thus, we can conclude that the coating
efficiency is declining over time. Apparently, twice the coating material was
being spread per pound of output in June than in January. The coating
18-30