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In its first month of operations, Literacy for the lliterate 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 weighted average cost flow assumptions. Assume a periodic inventory system is used. $($Round "Cost per Unit" to $2$

decimal places.$)$