Please show all the work with explanation.

Using the perpetual inventory system calculate the ending inventory under each of the following independent situations:

Beginning Inventory				400 units @ 4
January purchase				100 units @$5
February purchase				200 units @$6
March purchase				300 units @$7
used 301 units

Weighted Average

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FIFO

LIFO

Determine the ending inventory using the weighted average method

FIFO
using the same data above determine the ending inventory using FIFO cost flow assuming
125 units sold for $7 each

LIFO
using the same data above determine the ending inventory using the LIFO cost flow assuming
50 units are sold for $10each