$($a$1)$

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

Jan. $1,$$

Jan. $2$$$

Jan. $6,$$

Jan. $9,$$

Jan. $10$$

Jan. $23$$

Jan. $30$$ For each of the following cost flow assumptions, calculate $($i$)$ cost of goods sold, $($ii$)$ ending inventory, and $($iii$)$ gross profit. $($Round answers to $0$ decimal places, e$.$g$.125.)$

$(1)$ LIFO.

$(2)$ FIFO.

$(3)$ Moving$-$average.