Perpetual inventory using FIFO

Beginning inventory, purchases, and sales for Item Zeta$9$ are as follows:

Oct. $1$ Inventory

$56$ units @ $$25$

Oct. $7$ Sale

$45$ units

Oct. $15$ Purchase

Oct. $24$ Sale

$58$ units@ $$27$

$17$ units

Assuming a perpetual inventory system and using the first$-$in$,$ first$-$out $($FIFO$)$ method, determine $($a$)$ the cost of goods sold on October $24$ and $($b$)$ the inventory on October $31.$

$2.$ Cost of goods sold on October $24$

$2.$ Inventory on October $31$

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