Product (or manufacturing) costs consist of
  a.  direct materials, direct labor, and selling costs.
  b.  direct materials, direct labor, overhead, and operating expense.
  c.  prime costs and conversion costs.
  d.  prime costs and overhead.
  e.  selling and administrative costs.

      Last year, Wachman produced and sold 1,000 units at a price of $75 each. Total selling and administrative expense was $30,000.