| Date | 
Transaction | 
Unit | 
Amount | 
| June 1 | 
Beginning inventory | 
40 | 
$1,600 | 
| June 4 | 
Purchase | 
138 | 
6,072 | 
| June 18 | 
Purchase | 
53 | 
2,438 | 
| June 18 | 
Purchase return | 
(10) | 
(460) | 
| June 28 | 
Purchase | 
26 | 
1,300 | 
| Total | 
 | 
247 | 
$10,950 | 
Weighted average cost per unit = Cost of goods available /
Number of units
Weighted average cost per unit = $10,950 / 247 = $44.33 per
unit
Ending inventory units = 247 - 157 = 90 units
Sales = (107-13)*$70 + 63*$75
Sales = 6,580 + 4,725 = $11,305
2.
 | 
LIFO | 
FIFO | 
Average cost | 
| Ending inventory | 
$3,800 ($1,600+50*$44) | 
$4,202 ($1,300+43*$46+21*$44) | 
$3,990 (90*$44.33) | 
| Cost of goods sold | 
7,150 ($10,950-3,800) | 
6,748 ($10,950-4,202) | 
6,960 ($10,950-3,990) | 
| Gross profit | 
$4,155 ($11,305-7,150) | 
$4,557 ($11,305-6,748) | 
4,345 ($11,305-6,960) | 
 | 
LIFO | 
FIFO | 
Average cost | 
| Gross profit rate | 
36.75%($4,155/11,305*100) | 
40.31%($4,557/11,305*100) | 
38.43%($4,345/11,305*100) | 
In period of rising prices, LIFO gives highest cost of goods
sold and lowest gross profit  and FIFO gives lowest cost
of goods sold and highest gross profit