Firm J has net income of $68,400, sales of $900,000, and average total assets of $450,000. Required: Calculate Firm J's margin, turnover, and return on investment (ROI). Margin 1 Choose Denominator: Choose Numerator: Margin Margin 11 11 Turnover Choose Numerator: 1 Choose Denominator: Turnover Turnover 1 I! Return on Investment Choose Numerator: 1 Choose Denominator: Return on Investment Return on Investment =