How do I solve the second entries for the double entries like G83 in the LIFO table?

Dymac Appliances uses the periodic inventory system. Details regarding the inventory of appliances at January 1, purchases invoices during the next 12 months, and the inventory count at December 31 are summarized as follows:

Purchases Invoices
Model	Inventory, January 1		1st		2nd		3rd		Inventory Count, December 31
A10	__		4 at	$ 26	4 at	$ 29	4 at	$ 32	5
B15	8 at	$ 91	4 at	82	3 at	88	6 at	95	7
E60	3 at	70	3 at	60	15 at	63	9 at	65	5
G83	7 at	243	6 at	251	5 at	261	10 at	260	9
J34	12 at	50	10 at	52	16 at	59	16 at	60	13
M90	2 at	117	2 at	119	3 at	137	3 at	139	5
Q70	5 at	151	4 at	161	4 at	166	7 at	171	8

Required:

1. Determine the cost of the inventory on December 31 by the first-in, first-out method.

If the inventory of a particular model comprises one entire purchase plus a portion of another purchase acquired at a different unit cost, use a separate line for each purchase. If units are in inventory at two different costs, enter the units PURCHASED MOST RECENTLY first.

Dymac Appliances Cost of the Inventory-FIFO Method December 31
Model	Quantity		Unit Cost		Total Cost
A10	fill in the blank 1		$fill in the blank 2		$fill in the blank 3
A10	fill in the blank 4		fill in the blank 5		fill in the blank 6
B15	fill in the blank 7		fill in the blank 8		fill in the blank 9
B15	fill in the blank 10		fill in the blank 11		fill in the blank 12
E60	fill in the blank 13		fill in the blank 14		fill in the blank 15
G83	fill in the blank 16		fill in the blank 17		fill in the blank 18
J34	fill in the blank 19		fill in the blank 20		fill in the blank 21
M90	fill in the blank 22		fill in the blank 23		fill in the blank 24
M90	fill in the blank 25		fill in the blank 26		fill in the blank 27
Q70	fill in the blank 28		fill in the blank 29		fill in the blank 30
Q70	fill in the blank 31		fill in the blank 32		fill in the blank 33
Total					$fill in the blank 34

2. Determine the cost of the inventory on December 31 by the last-in, first-out method.

If the inventory of a particular model comprises one entire purchase plus a portion of another purchase acquired at a different unit cost, use a separate line for each purchase. If units are in inventory at two different costs, enter the OLDEST units first.

Dymac Appliances Cost of the Inventory-LIFO Method December 31
Model	Quantity		Unit Cost		Total Cost
A10	fill in the blank 35		$fill in the blank 36		$fill in the blank 37
A10	fill in the blank 38		fill in the blank 39		fill in the blank 40
B15	fill in the blank 41		fill in the blank 42		fill in the blank 43
E60	fill in the blank 44		fill in the blank 45		fill in the blank 46
E60	fill in the blank 47		fill in the blank 48		fill in the blank 49
G83	fill in the blank 50		fill in the blank 51		fill in the blank 52
G83	fill in the blank 53		fill in the blank 54		fill in the blank 55
J34	fill in the blank 56		fill in the blank 57		fill in the blank 58
J34	fill in the blank 59		fill in the blank 60		fill in the blank 61
M90	fill in the blank 62		fill in the blank 63		fill in the blank 64
M90	fill in the blank 65		fill in the blank 66		fill in the blank 67
M90	fill in the blank 68		fill in the blank 69		fill in the blank 70
Q70	fill in the blank 71		fill in the blank 72		fill in the blank 73
Q70	fill in the blank 74		fill in the blank 75		fill in the blank 76
Total					$fill in the blank 77

3. Determine the cost of the inventory on December 31 by the weighted average cost method.

Dymac Appliances Cost of the Inventory-Weighted Average Method December 31
Model	Quantity		Unit Cost		Total Cost
A10	fill in the blank 78		$fill in the blank 79		$fill in the blank 80
B15	fill in the blank 81		fill in the blank 82		fill in the blank 83
E60	fill in the blank 84		fill in the blank 85		fill in the blank 86
G83	fill in the blank 87		fill in the blank 88		fill in the blank 89
J34	fill in the blank 90		fill in the blank 91		fill in the blank 92
M90	fill in the blank 93		fill in the blank 94		fill in the blank 95
Q70	fill in the blank 96		fill in the blank 97		fill in the blank 98
Total					$fill in the blank 99