Weighted Average Cost Method with Perpetual Inventory The beginning inventory at Midnight Supplies and data on purchases and sales for a three-month period ending March 31 , are as follows: Midnight Susplies Perpetual Imentory Accesunt Weighted Averape Cost Method For the three menths ended March 31 2. Deter mine the total sairs, the total cost of menchardise soid, and the grest profe from zales fur the pensel 2. Determine the total sales, the total cost of merchandise sold, and the gross profit from sales for the period. 3. Determine the ending inventory cost as of March 31