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 21% = Profit Margin x Investment Turnover 10% X (a) (b) 27 % 24 % x 0.75 (c) X 1.5 10% (e) = 20% x (d) 15% 1.4 Determine the missing items identified by the letters as shown above. If required, round your answers to two decimal places. (b) % (c) % (d) (e) %