Firm D has net income of $74,000, sales of $1,500,000, and average total assets of $786,000. Calculate the firm's margin, turnover, and ROI.

Firm E has net income of $192,000, sales of $2,400,000, and ROI of 12.8%. Calculate the firm's turnover and average total assets.

Firm F has ROI of 12.60%, average total assets of $1,653,900, and turnover of 1.20. Calculate the firm's sales, margin, and net income.