Answer:
Oct. 1 Beginning inventory 50 x $24 = $1,200
Oct. 9 Purchase 130 x $26 = $3,380
Oct. 17 Purchase 100 x $27 = $2,700
Oct. 25 Purchase 60 x $29 = $1,740
total = 340 units, $9,020
total sales revenue will be equal for all 3 inventory methods = $11,200
FIFO
COGS = (50 x $24) + (130 x $26) + (80 x $27) = $6,740
ending inventory = $9,020 - $6,740 =$2,280
gross profit = $11,200 - $6,740 = $4,460
LIFO
COGS = (60 x $29) + (100 x $27) + (100 x $26) = $7,040
ending inventory = $9,020 - $7,040 =$1,980
gross profit = $11,200 - $7,040 = $4,160
WEIGHTED AVERAGE
COGS = ($9,020 / 340) X 260 = $6,897.65
ending inventory = $9,020 - $6,897.65 =$2,122.35
gross profit = $11,200 - $6,897.65 = $4,302.35