Determining Missing Items in Return Computation One item is omitted from each of the following computations of the return on Investment: Rate of Return on Investment Profit Margin Investment Turnover 17% 10% (a) (b) 12% 0.75 18% 1.5 (c) 20% 12% X (d) 15% 2 Determine the missing items identified by the letters as shown above. If required, round your answers to two decimal places. (b) % (c) % (d) %