Answer:
a) Jill's
beginning inventory = $44,500
purchases = $88,500 - $5,900 - $840 = $81,760
transportation in expenses = $1,180
total inventory costs = $127,440
cost of goods sold = $91,300
ending inventory = $127,440 - $91,300 = $36,140
b) Ken's
beginning inventory = $8,000
purchases = $36,900 - $1,200 - $360 = $38,460
transportation in expenses = $900
total inventory costs = $47,360
cost of goods sold = $33,900
ending inventory = $47,360 - $33,900 = $13,460