The inventory footnote from the dow chemical company's first quarter $2019$ sec report follows. The company also reports cost of goods sold for q$1$ of $2019$ of $10,707$ million. A$.$ What inventory costing method does dow chemical use? As of q$1$ of $2019$ what is the effect on cumilative pretax income and cash flow of using this inventory costing method, assuming a $30\%$ average cumulative tax rate. B$.$ Compute inventory turnover and average days inventory outstandinf for q$1$ of $2019.$ C$.$ Determine the fifo values for inventories and cost of goods sold for q$1$ of $2019.$