Assume the perpetual inventory system is used. Determine the costs assigned to ending inventory when costs are assigned based on the weighted average method. (Round your per unit costs to 2 decimal places.)

The information about inventory and sales is missing, so I looked for a similar question:

Beginning inventory on January 1: 390 $3.80 = $1,482

Purchase on January 9: 90 $4.00 = $360

Purchase on January 25: 120 $4.10 = $492

total number of units = 600

total value = $2,334

average cost per unit = $3.89

cost of goods sold = 430 units x $3.89 = $1,672.70

ending inventory = 170 units x $3.89 = $661.30  

answer; i believe the correct answer is (business necessity defense;