Answer:
a. $170
Step-by-step explanation:
For computing the ending inventory first we have to determine the average cost per unit which is shown below:
= (Beginning inventory units × price per unit + purchase inventory units × price per unit + purchase inventory units × price per unit + purchase inventory units × price per unit) ÷ (Beginning inventory units + purchase inventory units + purchase inventory units + purchase inventory units)
= (10 units × $7 + 15 units × $9 + 20 units × $10 + 12 units × $11) ÷ (10 units + 15 units + 20 units + 12 units)
= ($70 + $135 + $200 + $132) ÷ (57 units)
= ($537) ÷ (57 units)
= $9.42 per unit
Now the ending inventory is
= $9.42 × 18 units
= $169.56 i.e $170