Sheffield Design Works generated $572,460 in operating income on sales revenue of $2,726,000. The company had $1,700,000 in assets on January 1 and $3,000,000 in assets on December 31 . (ab) (a) Calculate Sheffield's margin. (Round answer to 0 decimal places, e.g. 65\%.) Sheffield's margin % (b) Calculate Sheffield's asset turnover. (Round answer to 2 decimal places, e.g. 0.65.) Sheffield's asset turnover times eTextbook and Media Attempts: 0 of 3 used Calculate Sheffield's return on investment. (Round answer to 2 decimal places, e.g. 5.12\%.) Sheffield's return on investment %