Can I get help with this please?

Pemberton Company began March with 40 units of inventory that cost a total of $800. During March. Pemberton purchased and sold goods as follows: 0 (Click the icon to View the transactions.) Calculate the gross margin amount using the weighted-average method assuming Pemberton uses a periodic inventory system. Before we can calculate gross margin, we must rst determine the cost of goods sold, using the periodic method of costing inventory. Start by determining the formula, and then enter the amounts. (Round your answers to the nearest whole dollar.) | | |:| Cost of goods available for sale Less: Cost of goods sold MUM 8 Purchase: 60 units at $12.50 14 Sale: 50 units at $25 22 Purchase: 40 units at $15.00 27 Sale: 60 units at $30.00