Help Save & Problem 15-22 Return on investment LO 15-6 Munoz Corporation's balance sheet indicates that the company has $600,000 invested in operating assets. During 2018, Munoz earned operating income of $72,000 on $1,200,000 of sales. points Required co a. Compute Munoz's profit margin for 2018 b. Compute Munoz's turnover for 2018 c. Compute Munoz's return on investment for 2018 d. Recompute Munoz's ROI under each of the following independent assumptions: (1) Sales increase from $1,200,000 to $1,440,000, thereby resulting in an increase in operating income from $72,000 to $80,640. (2) Sales remain constant, but Munoz reduces expenses, resulting in an increase in operating income from $72,000 to $74,400. (3) Munoz is able to reduce its invested capital from $600,000 to $480,000 without affecting operating income. Complete this question by entering your answers in the tabs below. Reg A to C Reg D Compute Munoz's profit margin, turnover and return on investment for 2018. (Round "Profit margin" and "Return on investment to 1 decimal place.) a. Profit margin Turnover Return on investment