Units to be Manufactured=Expected Sales Volume+Desired Ending Inventory−Beginning Inventory

First, we sum up the expected sales volume for the three territories:

$4,000\left(Territory X\right)+6,000\left(Territory Y\right)+5,500\left(Territory Z\right)=15,500$

Next, we add the desired ending inventory and subtract the beginning inventory:

$15,500\left(Expected Sales Volume\right)+18,000\left(Desired Ending Inventory\right)-16,000\left(Beginning Inventory\right)=17,50015,500\; (\backslash text\{Expected\; Sales\; Volume\})\; +\; 18,000\; (\backslash text\{Desired\; Ending\; Inventory\})\; –\; 16,000\; (\backslash text\{Beginning\; Inventory\})\; =\; 17,500$

So, the number of units expected to be manufactured in June is:

$b\mathrm{.}17,500b.\; 17,500$

$b.\; 17,500$