How do I Compute the Return of Common stockholders equity? Step by step

How do I obtain the calculation of prefered dividends and the average of common stock holder equity

24 of 35 13.7-18a Standard Electronics Balance Sheet As of December 31, 2019 Standard Electronics Balance Sheet As of December 31, 2018 $576,000 327,000 249,000 $576,000 $494,000 285,000 209,000 494,000 Total Assets Total Liabilities Total Stockholders' Equity (all common) Total Liabilities and Stockholders' Equity Net income for 2019 was $20,000. Compute the rate of return on common stockholders' equity for 2019. (Round your final answer to two decimal places.) C) A. 8.03% . 8.73% C. 3.74% D. 3.47%