The following two questions relate to the information presented below. Purchases are presented in chronological order.

$\backslash$table$[[$Beginning Inventory,$300$ units,$$8\mathrm{.}00$ each$],[$First purchase,$200$ units,$$7\mathrm{.}75$ each$],[$Second purchase,$250$ units,$$7\mathrm{.}00$ each$],[$Third purchase,$180$ units,$(2)$ $$6\mathrm{.}25$ each$],[$Fourth purchase,$125$ units,$(1)$ $$6\mathrm{.}00$ each$]]$

During the period, $500$ units were sold

$19.$ If the company uses the weighted average method, how much was the cost of goods sold?

a$.$ $$3,590$

b$.$ $$3,500$

c$.$ $$3,821$

d$.$ $$3,710$

$20.$ If the company uses LIFO, how much was the cost of the ending inventory?

a$.$ $$4,335$

b$.$ $$3,821$

c$.$ $$4,160$

d$.$ $$3,625$