How could the different inventory costing methods used by CVS$,$ Walmart, and Walgreens impact their respective income statements and balance sheets?

Three pharmacy giants, CVS Health, Walmart, and Walgreens Boots Alliance each use a different inventory costing method. CVS uses weighted$-$average cost, Walmart uses FIFO, and Walgreens uses LIFO.

Here is a hypothetical example that highlights the potential differences in income statements and balance sheets that could arise simply because of the use of a different inventory costing method.

Basic facts calculations simple, a "unit" represents one million bottles.

Beginning inventory: $3$ units @ $$20\mathrm{.}00$

Purchases: $2$ units @ $$25\mathrm{.}00$

Ending inventory: $1$ unit