La compaia BC1 tenia la siguiente informacin a diciembre 31 de 2020: Service revenue $840,000 Common stock 180,000 Equipment 240,000 Operating expenses 750,000 Cash 210,000 Dividends 60,000 Supplies 30,000 Accounts payable 120,000 Accounts receivable 90,000 Retained earnings, 1/1/20 450,000 Determine las ganancias retenidas (retained earnings) de la compaia a diciembre 31 de 2020: O$ 30,000 $ 480,000 O $ 540,000 $ 450,000