Andrew's Sporting Goods had the following inventory records for the month of January.

Beginning inventory

$70$ units @ $$400$ per unit

Sales, Jan. $1-$ Jan. $10$

$50$ units

Purchase, Jan. $11$

$40$ units @ $$412$ per unit

Sales, Jan. $12-$ Jan. $20$

$50$ units

Purchase, Jan. $21$

$50$ units @ $$420$ per unit

Sales, Jan. $22-31$

$40$ units

Assuming the Weighted$-$Average method is used, what is the total cost of Andrew$$s ending inventory on January $31?$

Question $5$ options:

A$)$

$$8,360$

B$)$

$$8,000$

C$)$

$$8,400$

D$)$

$$8,200$