Determining missing items in return on investment computation One item is omitted from each of the following computations of the return on investment: Return on Investment Profit Margin X Investment Turnover 28 % 10 % (a) 0.75 (b) 24 % 18 % (c) 1.5 16 % 20 % X (d) 2 15 % x Determine the missing items identified by the letters as shown above. If required, round your answers to two decimal places. (a) (b) 96 % (d) (e) 9%