Determine the costs assigned to the December $31$ ending inventory based on the FIFO method.

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 $$38$ each.

Purchases on December $710$ units @ $$24\mathrm{.}00$ cost

Purchases on December $1420$ units @ $$30\mathrm{.}00$ cost

Purchases on December $2115$ units @ $$32\mathrm{.}00$ cost