calculate the average perpetual

On 1 Jan'21 the company has a beginning inventory of 100 units @\$100 The following is a transaction of buying and selling of merchandise \begin{tabular}{|c|r|r|r|r|r|} \hline & \multicolumn{3}{|c|}{ Unit } & \multicolumn{3}{|c|}{ Cost/ unit } & \\ \hline 04-Feb Purchased & 100 & $ & 100 & \\ \hline 10-Mar Purchased & 50 & $ & 105 & \\ \hline 18-Apr Purchased & 30 & $ & 110 & \\ \hline 01-Mei Sold & 120 & & 112 & \\ \hline 10-Jun Purchased & 80 & $ & & Selling price $250 \\ \hline 23-Jul Sold & 100 & & \\ \hline \end{tabular}