问题:A total cost is described as staying the same over a certain activity range and then increasing but remaining stable over a revised activity range in the short term.
  What type of cost is this?
  A. A variable cost
  B. A stepped fixed cost
  C. A semi-variable cost
  D. A fixed cost
  答案:The correct answer is:A stepped fixed cost
  The cost described is a stepped fixed cost. A stepped fixed cost is fixed in nature but only within certain levels of activity.