Gross Profit Alternative cost flow perpetual

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Gross Profit

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Parker Company uses a perpetual inventory system. It entered into the following calendar-year 2005
Purchases and sales transactions:
PROBLEM SET A
Problem 6-1A
Alternative cost flows—perpetual
P1
Date Activities Units Acquired at Cost Units Sold at Retail
Jan. 1 Beginning inventory.. . 600 units @ $44/unit
Feb. 10 Purchase.. . 200 units @ $40/unit
Mar. 13 Purchase.. . 100 units @ $20/unit
Mar. 15 Sales.. . 400 units @ $75/unit
Aug. 21 Purchase.. . 160 units @ $60/unit
Sept. 5 Purchase.. . 280 units @ $48/unit
Sept. 10 Sales.. . 200 units @ $75/unit
Totals.. . 1,340 units 600 units
Required
1. Compute cost of goods available for sale and the number of units available for sale.
2. Compute the number of units in ending inventory.
3. Compute the cost assigned to ending inventory using (a) FIFO, (b) LIFO, (c) specific identification
(Note: The units sold consist of 500 units from beginning inventory and 100 units from the
March 13 purchase), and (d) weighted average.
4. Compute the gross profit earned by the company for each of the four costing methods in part 3
I did most of it, but I got stuck on d) part 3 and number 4 can you direct me on how to calculate the answers. Please Please Help.:confused:

Part 3 involves the most work and is therefore an awful lot to expect someone to try to explain to you in a post like this. If you've made some attempt to do it, show us those attempts -- we can then see where you're getting off.

You can't do 4 until you have 3 done.