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Trey Monson starts a merchandising business on December $1$ and enters into the following three inventory purchases. Monson uses a periodic inventory system. Also, on December $15,$ Monson sells $15$ units for $$20$ each.

$\begin{array}{cc}\text{P}\text{u}\text{r}\text{c}\text{h}\text{a}\text{s}\text{e}\text{s}on\text{D}\text{e}\text{c}\text{e}\text{m}\text{b}\text{e}\text{r}7& 10\text{u}\text{n}\text{i}\text{t}\text{s}\text{@}\text{\$}6cost\\ \text{P}\text{u}\text{r}\text{c}\text{h}\text{a}\text{s}\text{e}\text{s}on\text{D}\text{e}\text{c}\text{e}\text{m}\text{b}\text{e}\text{r}14& 20\text{u}\text{n}\text{i}\text{t}\text{s}\text{@}\text{\$}12cost\\ \text{P}\text{u}\text{r}\text{c}\text{h}\text{a}\text{s}\text{e}\text{s}on\text{D}\text{e}\text{c}\text{e}\text{m}\text{b}\text{e}\text{r}21& 15\text{u}\text{n}\text{i}\text{t}\text{s}\text{@}\text{\$}14cost\end{array}$

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

$\backslash$table$[[$Periodic FIFO:$],[,$Goods Available for Sale,Cost of Goods Sold,Ending Inventory$],[,$# of units,$\backslash$table$[[$Cost per$],[$unit$]],\backslash$table$[[$Cost of Goods$],[$Available for$],[$Sale$]],\backslash$table$[[$# of$],[$units$],[$sold$]],\backslash$table$[[$Cost$],[$per unit$]],\backslash$table$[[$Cost of$],[$Goods Sold$]],\backslash$table$[[$# of units$],[$in ending$],[$inventory$]],\backslash$table$[[$Cost per$],[$unit$]],\backslash$table$[[$Ending$],[$Inventory$]]],[$Purchases:$],[$December $7],[$December $14,,,,,,,,$$$0\mathrm{.}00,],[$December $21,,,,,,,,0\mathrm{.}00,],[$Total$,,,,,,,,,]]$Trey Monson starts a merchandising business on December $1$ and enters into the following three inventory purchases. Monson uses a periodic inventory system. Also, on December $15,$ Monson sells $15$ units for $$20$ each.

Purchases on December $710$ units @ $ $6$ cost

Purchases on December $1420$ units @ $$12$ cost

Purchases on December $2115$ units @ $$14$ cost

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