is it retained earnings (beginning of the year) + contributed capital = stockholders equity

or is it

retained earnings (end of year) + contributed capital = stockholders equity

retained earnings (end of year) + contributed capital = stockholders equity

Retained earnings (E) = Retained Earnings (B) + Net income - Dividends

is it retained earnings (beginning of the year) + contributed capital = stockholders equity

or is it

retained earnings (end of year) + contributed capital = stockholders equity