Fundamentals of Cost Accounting 2nd Edition by William Lanen, Carolyn Wells, Michael Maher

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The following costs are labeled fixed or variable according to a typical designation in accounting. Under which circumstances would any of these costs behave in a manner opposite to that listed
a. Direct labor-variable.
b. Equipment depreciation-fixed.
c. Utilities (with a minimum charge)-variable.
d. Supervisory salaries-fixed.
e. Indirect materials purchased in given sizes that become spoiled within a few days- variable.