In its first month of operations, Wildhorse Company made three purchases of merchandise in the following sequence: $(1)500$ units at $$5,(2)600$ units at $$6,$ and $(3)700$ units at $$8.$ Wildhorse uses a periodic inventory system.

$($a$1)$

Your answer is incorrect.

Calculate weighted$-$average unit cost. $($Round answer to $3$ decimal places, e$.$g$.5\mathrm{.}125.)$

Weighted$-$average unit cost $