Problem 15-22 Return on investment LO 15-6 Rooney Corporation's balance sheet indicates that the company has $630,000 invested in operating assets. During 2018, Rooney earned operating income of $79,380 on $1,260,000 of sales 229 Required a. Compute Rooney's profit margin for 2018. b. Compute Rooney's turnover for 2018. c. Compute Rooney's return on investment for 2018 d. Recompute Rooney's ROl under each of the following independent assumptions: () Sales increase from $1,260,000 to $1,512,000, thereby resulting in an increase in operating income from $79,380 to $90,720 2) Sales remain constant, but Rooney reduces expenses, resulting in an increase in operating income from $79,380 to $81,900 (3) Rooney is able to reduce its invested capital from $630,000 to $504,000 without affecting operating income Complete this question by entering your answers in the tabs below. Req A to C Reg D Compute Rooney's profit margin, turnover and return on investment for 2018. (Round "Profit margin" and "Return on investment to 1 decimal place.) a Peofit margin b. Turnover c. Return on investment