Karin, Inc. has 5,000 shares of 6%, $600 par value, cumulative preferred stock and 100,000 shares of $6 par value common stock outstanding. There were no dividends declared in 2018. The board of directors declared and paid dividends of $300,000 each in 2019 and 2020. What is the amount of dividends received by the common stockholders in 2020?