4. Assume the office manager received a call from a customer who wanted to purchase 100 units of product (no sales commission on this order). What is the per-unit profit contributed by the sale of these additional 100 units (assume break-even point has already been reached by the sales team)? Show your computations and explain your answer.

5. Suppose a loyal customer requested to place a special order to buy 100 units at $5.50 per unit. This is a one-time only order, Windward has the capacity to fill this order, and by filling the order no other regular order will go unfilled. No sales commission on special order; assume BEP has already been met.