The Following Lots of a Particular Commodity Were Available for Sale

The following lots of a particular commodity were available for sale during the year: $\begin{array}{lc}\text { Beginning invent ory } & 5 \text { units at } \$ 61 \\\text { First purchase } & 15 \text { units at } \$ 63 \\\text { Second purchase } & 10 \text { units at } \$ 74 \\\text { Third purchase } & 10 \text { units at } \$ 77\end{array}$ The firm uses the periodic system and there are 20 units of the commodity on hand at the end of the year.
What is the amount of cost of good sold for the year according to the average cost method?

A) $1,380
B) $1,375
C) $1,510
D) $1,250