1. Variable costs can be described by which of the following?
   1. Per unit cost changes inversely as activity changes
   2. Per unit cost remains constant as activity changes
   3. Its total changes proportionately as activity changes
   4. b & c
   5. a & c
   6. Variable costs can be described by which of the following?
      1. Per unit cost changes inversely as activity changes
      2. Per unit cost remains constant as activity changes
      3. Its total changes proportionately as activity changes
      4. b & c
      5. a & c