In its first month of operations, Lily Company made three purchases of merchandise in the following sequence: $(1)350$ units at $$6,$

$(2)450$ units at $$7,$ and $(3)200$ units at $$8.$

$($a$)$

Calculate the average unit cost. $($Round answer to $2$ decimal places, e$.$g$.15\mathrm{.}25.)$

Average unit cost $

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$($b$).$

Compute the cost of the ending inventory under the average$-$cost method, assuming there are $380$ units on hand. $($Round answer to Odecimal places, e$.$g$.1,250.)$

The cost of the ending inventory

$