The following financial information is available for Flint Corporation.

(in millions) 2017 2016
Average common stockholders’ equity $2,825 $2,925
Dividends declared for common stockholders 335 630
Dividends declared for preferred stockholders 45 45
Net income 605 685

Required:
Calculate the payout ratio and return on common stockholders’ equity ratio for 2017 and 2016.