Problem 15-22 Return on investment LO 15-6 Helton Corporation's balance sheet indicates that the y has $300,00 nvested in operating assets During 2014, Helton earned operating income of $620u on $630,000 of sales Required a. Compute Helton's profit margin for 2014. (Round your answer to 2 decimal places. (ie., 2345 should be entered as 23.45).) b. Compute Helton's turnover for 2014. (Round your answer to 2 decimal places.) c. Compute Helton's return on investment for 2014 (Round intermediate calculations and final answer to 2 decimal places. (i.e., 2345 should be entered as 23.45)) intermediate calculations. Round your answers to 2 decimal places. (le., 2345 should be entered as 23.45)) d. Recompute Heiton's ROI under each of the following independent assumptions (Do not round (1) Sales increase from $630,000 to $750,000, thereby resulting in an increase in operating income from $62,000 to $74,000 remain constant, but Helton reduces expenses, resulting in an