The information presented here represents selected data from the December 31, 2013, balance sheet and income statements for the year then ended.

Retained earnings, December 31, 2013	$	399,570
Decrease in total liabilities during 2013		87,020
Gain on the sale of buildings during 2013		30,590
Dividends declared and paid in 2013		8,550
Proceeds from sale of common stock in 2013		93,860
Net income for the year ended December 31, 2013		42,940

Required:

Prepare the Statement of Stockholders' Equity for the year ended December 31, 2013 and calculate the retained earnings balance as of December 31, 2012. (Negative amount should be indicated by a minus sign.)

How can we Calculate the Retained earnings as of December 31st 2012 ??

thanks