Perpetual inventory using FIFO

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

Date Line Item Description Value

Oct. $1$ Inventory $70$ units @ $$23$

Oct. $7$ Sale $55$ units

Oct. $15$ Purchase $63$ units @ $$26$

Oct. $24$ Sale $19$ 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 $31.$