I need assistance with this accounting question

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= Prot Margin x Investment Turnover 23 % =10 % x(a) (b) =20 % 240.75 33 % :(c) x15 10% =20 % x(d) (6) =15 % x1.4 Determine the missing items identied by the letters as shown above. If required, round your answers to two decimal places. (a) I (b) I 9/0