Answer:
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