Required:

a$.$ Firm D has net income of $$69,768,$ sales of $$1,453,500,$ and average total assets of $$765,000.$ Calculate the firm's margin, turnove and ROI.

b$.$ Firm $E$ has net income of $$113,841,$ sales of $$1,807,000,$ and ROI of $8\mathrm{.}19\%.$ Calculate the firm's turnover and average total assets.

c$.$ Firm $F$ has ROI of $12\mathrm{.}60\%,$ average total assets of $$1,560,000,$ and turnover of $0\mathrm{.}8.$ Calculate the firm's sales, margin, and net income.