MCB Ltd$.$ uses a perpetual inventory system and reports the following transactions for

the month of January:

Required:

$(1)$ Under the FIFO Cost$-$flow method, $(2)$ Under the LIFO Cost$-$flow method, and $(3)$

Under the Weighted Average Cost$-$flow method;

a$.$ Journalize the transactions and prepare the ledger accounts $($T$-$accounts$)$

b$.$ Calculate Gross Profit

c$.$ Calculate Gross Profit Margin

d$.$ Calculate the Cost of Ending Inventory