Outstanding stock of the Crevusse Corporation included 40000 shares of $5 par common stock and 20000 shares of 5%, $10 par noncumulative preferred stock. In 2019, Crevusse declared and paid dividends of $8000. In 2020, Crevusse declared and paid dividends of $24000. How much of the 2020 dividend was distributed to preferred shareholders?