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Required information

$[$The following information applies to the questions displayed below.$]$

Trey Monson starts a merchandising business on December $1$ and enters into the following three inventory purchases. Monson uses a perpetual inventory system. Also, on December $15,$ Monson sells $15$ units for $$21$ each.

$\backslash$table$[[$Purchases on December $7,10$ units @ $$7\mathrm{.}00$ cost$],[$Purchases on December $14,20$ units @ $$13\mathrm{.}00$ cost$],[$Purchases on December $21,15$ units @ $$15\mathrm{.}00$ cost$]]$

Required:

Determine the costs assigned to the December $31$ ending inventory