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 Investment Turnover 28 % 10 % (a) (b) 28 % 0.75 27 % (c) X 1.5 10 % = 20 % (d) (e) = 15 % 1.6 Determine the missing items identified by the letters as shown above. If required, round your answers to two decimal places. (a) (b) % (c) llll % (d) (e) %