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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 $$35$ each.

$\backslash$table$[[$Purchases on December $7,10$ units & $$21\mathrm{.}00$ cost$],[$Purchases on December $14,20$ units & $$27\mathrm{.}00$ cost$],[$Purchases on December $21,15$ units & $$29\mathrm{.}00$ cost$]]$

Determine the costs assigned to ending inventory when costs are assigned based on the LIFO method.