how to calculate the amount of dividends that should be paid to the common stock holders out of the 50,000 in dividends declared in 2019?

Frago Bankshares Corp has 5,000 shares of 6%, $100 par value, cumulative preferred stock. The preferred stock had been issued in 2008 during the Great Recession in the US and is still outstanding at year-end December 2019. As of the December 2015 year end there were no preferred dividends in arrears. Since December 2016 the board of directors declared annual dividends as follows: Declaration Date Total Dividends Declared December 2016 $20,000 December 2017 $25,000 December 2018 $35,000 December 2019 $50,000