Beginning inventory, purchases, and sales for item Zeta$9$ are as follows: Oct $1$ Inventory $37$ units @ $$24$ Oct $7$ Sale $30$ units Oct $15$ Purchase $36$ units @ $$27$ Oct $24$ Sale $11$ units. Assuming a perpetual inventory system and using the FIFO method, determine a$.$ the cost of goods sold on oct $24$ and b$.$ the inventory value on Oct $31.$