Three identical units of Item Magnesium XP are purchased during May, as shown below.
Item Magnesium XP Units Cost
May 3 Purchase 1 $130
May 10 Purchase 1 136
May 19 Purchase 1 142
Total 3 $408
Assume that one unit is sold on May 23 for $153. Determine the gross profit for May and ending inventory on May 31 using (a) FIFO, (b) LIFO, and (c) average cost methods.