Sandhill Company uses a perpetual inventory system and reports the following for the month of June.

$($a$1)$

Calculate the weighted$-$average cost per unit, using a perpetual inventory system. Assume a sale of $400$ units occurred on June $15$

for a selling price of $$8$ and a sale of $45$ units on June $27$ for $$9.($Round intermediate calculations to $0$ decimal places, e$.$g$.152$ and final

answers to $3$ decimal places, e$.$g$.5\mathrm{.}125.)$

June $1$

June $12$

June $15$

June $23$

June $27$