need explain-

decide to calculate the current ratio, working capital, debt to total assets, profit margin, and a new one you found -- accounts receivable turnover and accounts receivable turnover in days. You remember from your BUS class there is a similar ratio like this for inventory. Your Aunt doesnt understand the value of ratios so you decide you should send him a memo explaining in your own words what ratios do, how they are used, and why each of these ratios you calculated are important to an investor.