There are 27 500 units of Part Number X35 on order with the suppliers and 16 250 units outstanding on existing customers’ orders.
  If the free inventory is 13 000 units, what is the physical inventory?
  A 1 750
  B 3 250
  C 24 250
  D 29 250
 
  Free inventory balance = units in inventory + units on order from suppliers – units outstanding on customers’ orders
  So, 13 000 = units in inventory + 27 500 – 16250
  這樣子答案就出來(lái)啦。。。所以,答案是A