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 X 16 % 10 % X (a) (b) 12 % 0.75 27% (c) X 1.5 12 % 20% 15 % 1.2 Determine the missing items identified by the letters as shown above. If required, round your answers to two decimal places. (a) (b) % % (d) (e) %