Can you show calculations please?

Total Shles DEC JAN FEB MAR $ $ $ $ 1,000,000.00 1.100.000,00 1.210,000.00 1,331,000.00 1.000.00 APRIL $ 1.397,550.00 1. Cost of goods sold - this is normally 70% of total sales. In order to have adequate stocks of inventory on hand, the company attempts to have inventory at the end of each month equal to half (50%) of the next month's projected cost of goods sold Inventory is purchased on account and usually settled as follows: 60% dunng the month of purchase 40% during the month after purchase