$2.$ The company provided the following inventory data for $20$X$1$:

Jan $1$ Beginning inventory $1,000$ units @ $$4\mathrm{.}00$

May $18$ Cash Purchase $2,000$ units @ $$4\mathrm{.}50$

Oct $5$ Credit Purchase $2,000$ units @$$4\mathrm{.}80$

Nov $24$ Credit Sales $2,000$ units@$8\mathrm{.}00$

Dec $1$ Credit Purchase $3,000$ units @$$5\mathrm{.}20$

The company$$s reporting date is December $31.$

Required $(21$ marks$)$:

$(1)$ Assume that the company uses perpetual inventory system and weighted average method, prepare journal entries on Oct $5$ and Nov $24$

$(2)$ Assume that the company uses periodic inventory system and weighted average method, prepare journal entries on Dec $1$ and Dec $31.$

$(3)$ Assume that the company uses periodic inventory system and FIFO, prepare journal entries on May $18$ and Dec $31.$

$(4)$ In $20$X$2,$ the company found an understatement of $$3,000$ for $20$X$1$s ending inventory. The income tax rate is $30\%.$ Prepare journal entries to correct this error.