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.