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In its first month of operations, Literacy for the Illiterate opened a new bookstore and bought merchandise in the following

order: $(1)180$ units at $$5$ on January $1,(2)510$ units at $$6$ on January $8,$ and $(3)810$ units at $$7$ on January $29.$

Assuming $900$ units are on hand at the end of the month, calculate the cost of goods available for sale, ending inventory, and cost of

goods sold under FIFO. Assume a periodic inventory system is used. $($Round "Cost per Unit" to $2$ decimal places.$)$