PB 11. LO 10.3 Calculate a) cost of goods sold, b) ending inventory, and c) gross margin for B76 Company, considering the following transactions under three different cost allocation methods and using perpetual inventory updating. Provide calculations for weighted average (AVG).

\begin{tabular}{|lccc|} \hline & Number of Units & Unit Cost & Sales \\ Beginning inventory & 420 & $200 & \\ Sold & 150 & & $401 \\ Purchased & 250 & 205 & \\ Sold & 275 & & 421 \\ Purchased & 200 & 215 & \\ Sold & 260 & & 441 \\ Ending inventory & 185 & & \\ \hline \end{tabular}