UEL uses the perpetual inventory method and its reporting ending 31 December. Year: 2022 \begin{tabular}{|l|l|r|r|} \hline \multicolumn{1}{|c|}{ Date } & \multicolumn{1}{c|}{ Details } & Unit number & Unit cost (CHF) \\ \hline 1/1 & Opening inventories & 800 & 7 \\ \hline 6/1 & Purchased & 300 & 7,05 \\ \hline 5/2 & Sold @ CHF 12 per unit & 1.000 & \\ \hline 19/3 & Purchased & 1.100 & 7,35 \\ \hline 24/3 & Purchase returns & 80 & 7,35 \\ \hline 10/4 & Sold @ CHF 12,10 per unit & 700 & \\ \hline 22/6 & Purchased & 8.400 & 7,5 \\ \hline 31/7 & Sold@ CHF 13,25 per unit & 1.800 & \\ \hline 4/8 & Sales returns @ CHF 13,25 per unit & 20 & \\ \hline 4/9 & Sold@ CHF 13,50 per unit & 3.500 & \\ \hline 6/10 & Purchased & 500 & \\ \hline 27/11 & Sold @ CHF 15 per unit & 3.100 & \\ \hline \end{tabular} Requirements: 1. Calculate the cost of inventory on hand at 31/12/2022 and the cost of sales for the year ending 31/12/2022 : Assuming with: a/ FIFO cost flow assumption b/ Weighted average cost flow assumption 2. Prepare Income statement up to Gross profit for UEL under: a/ FIFO b/ WAC 3. Do the same requirements for UEL when the company uses the periodic inventory system