During 2012,a Company Sells 20 Units of Inventory Calculate Ending Inventory and Cost of Goods Sold for 2012

During 2012,a company sells 20 units of inventory.The company has the following inventory purchase transactions for 2012:
$$\begin{array} { l l c c c } \text { Date } & { \begin{array} { c } \text { Transaction }\end{array} } & \begin{array} { c } \text { Number } \\\text { of Units }\end{array} & \begin{array} { c } \text { Unit } \\\text { Cost }\end{array} & \begin{array} { l } \text { Total } \\\text { Cost }\end{array} \\\text { Jan. 1 } & \text { Beginning inventory } & 15 & \$ 60 & \$ 900 \\\text { Sep. 8 } & \text { Purchase } & 10 & 62 & 620 \\\hline & & 25 & & \$ 1,520 \\\hline\end{array}$$
Calculate ending inventory and cost of goods sold for 2012 assuming the company uses weighted-average cost with a periodic inventory system.