The following information is available for Aerius Corporation for the current year:

Net income $$160,000$

Preferred dividends $30,000$

Interest expense $18,000$

Beginning of year:

Total assets $900,000$

Total liabilities $300,000$

Total common shareholders' equity $375,000$

End of year:

Total assets $950,000$

Total liabilities $350,000$

Total common shareholders' equity $400,000$

calculate

a$.$ The return on assets for Aerius Corporation is:

b$.$ The return on equity for Aerius Corporation is: