Inventory valuation. The following purchases and sale transactions occurred during the month of November for L&L Industries:

purchases:

Nov $1300$ units at $4\mathrm{.}00$ dollars $($opening balance$)$

nov $7500$ units at $4\mathrm{.}25$ dollars

nov $16400$ units at $4\mathrm{.}30$ dollars

sales

nov $4100$ units at $8\mathrm{.}00$ dollars

nov $6100$ units at $9\mathrm{.}00$ dollars

nov $9200$ units at $8\mathrm{.}50$ dollars

nov $11100$ units at $9\mathrm{.}00$ dollars

nov $17300$ units at $8\mathrm{.}50$ dollars

Assume that L&L Industries uses a

perpetual inventory system.

Compute the ending inventory and the cost of goods sold under each of the following inventory cost$-$flow assumptions:$($show your calculations$)$

a$.$ FIFO

b$.$ LIFO

c$.$ Average cost

write your answer in a table for each assumption these tables should have the following columns :

purchase $-$ cost of goods sold $-$ inventory respectively