Answer: Option (b) is correct.
Step-by-step explanation:
Given that,
Net income = $160,000
Dividend paid to common stockholder = $50,000
Dividend paid to preferred stockholders = $20,000
common stockholders' equity at the beginning = $870,000
common stockholders' equity at the end = $1,130,000
![Average\ common\ stockholders\ equity=(Beginning\ Balance + Ending\ Balance)/(2)](https://img.qammunity.org/2020/formulas/business/college/hnr63svoi33ifdqbvsjxm7tytxj1woxu5r.png)
![Average\ common\ stockholders\ equity=(870,000 + 1,130,000)/(2)](https://img.qammunity.org/2020/formulas/business/college/ciqj1vsugshgbq31czr2tfkr9lix8i30eo.png)
![=(2,000,000)/(2)](https://img.qammunity.org/2020/formulas/business/college/8kyt9vqoiirp3gnlyjcx8p55erk4xsaub2.png)
= 1,000,000
![Return\ on\ common\ stockholders\ equity=(Net\ income-preferred\ dividend)/(Average\ common\ stockholders\ equity)](https://img.qammunity.org/2020/formulas/business/college/on0uaer9bdim92cm7iw4rpwemfvcqsz98w.png)
![Return\ on\ common\ stockholders\ equity=(160,000-20,000)/(1,000,000\ equity)](https://img.qammunity.org/2020/formulas/business/college/c0ae6qntie76903nt3jk2ip9h7q1ddmfta.png)
= 14%