Assume that three identical units of merchandise are purchased as follows:

$1$ unit purchased on July $1$st for $$107$

$1$ unit purchased on July $15$th for $$124$

$1$ unit purchased on July $25$th for $$141$

If $1$ unit is sold on July $31$st for $$320,$ what is the value of ending inventory using the weighted average method? $($Round your answer to the nearest whole dollar$).$