Use the following information regarding Tiara Corp. to answer Questions $1$ to $3$:

Quarter Units held$/$purchased Unit cost $($$$)$ Total cost $($$$)$

Opening inventory $1530450$

$11530450$

$21235420$

$32025500$

$43020600$

Total $922420$

Given that Tiara sold $10,12,15,$ and $20$ units in the four quarters respectively, answer the following questions:

$1.$ Determine ending inventory if the company uses LIFO cost flow assumption.

$2.$ Determine cost of goods sold if the company uses FIFO cost flow assumption.

$3.$ Determine ending inventory if the company uses the weighted average cost flow assumption