Help please,

I am unsure how to calulate this problem

The following information is available for the Gold Company:

Net income for the year ended December 31, 2014 $127.4

Retained earnings, December 31, 2014 150.0

Retained earnings, December 31, 2013 180.0

Total assets, December 31, 2014 470.0

Total assets, December 31, 2013 442.0

Total liabilities, December 31, 2014 240.0

Total liabilities, December 31, 2013 182.0

What is the return on stockholders' equity for the year ended December 31, 2014?

A) 24.1%

B) 27.1%

C) 52.0%

D) 55.4%