calculate the following

Required information [The following information applies to the questions displayed below.] Hemming Company reported the following current-year purchases and sales for its only product. emming uses a periodic inventory system. Ending inventory consists of 45 units from the March 14 purchase, 75 units from the July purchase, and all 100 units from the October 26 purchase. Using the specific identification method, calculate the following. a) Cost of Goods Sold using Specific Identification \begin{tabular}{|c|c|c|c|c|c|c|c|c|c|} \hline \multirow[b]{2}{*}{ Date } & \multicolumn{3}{|c|}{ Available for Sale } & \multicolumn{3}{|c|}{ Cost of Goods Sold } & \multicolumn{3}{|c|}{ Ending Inventory } \\ \hline & Activity & \# of units & CostPerUnit & #ofunitssold & CostPerUnit & coGs & \begin{tabular}{|c|} Ending \\ Inventory \\ Units \end{tabular} & CostPerUnit & EndingInventoryCost \\ \hline January 1 & Beginning Inventory & 200 & $10.00 & & $10.00 & $ & & $10.00 & $ \\ \hline March 14 & Purchase & 350 & $15.00 & & $15.00 & 0 & 45 & $15.00 & 675 \\ \hline July 30 & Purchase & 450 & $20.00 & & $20.00 & 0 & 75 & $20.00 & 1,500 \\ \hline October 26 & Purchase & 100 & $25.00 & & $25.00 & 0 & 100 & $25.00 & 2,500 \\ \hline & & 1,100 & & 0 & & $ & 220 & & 4,675 \\ \hline \end{tabular} b) Gross Margin using Specific Identification \begin{tabular}{|l|l|l|} \hline & & \\ \hline Less: & & \\ \hline Equals: & & \\ \hline \end{tabular}