Mo. Saleh Co. has the following accounts for the year 2020: sales revenues of 48000, sales return and allowance of 1200, sales discount of 800, cost of goods sold 20000, freight in cost 400 (FOB shipping point), operating expenses of 4000, rent revenues of 1500, gain from sales of equipment 2500, interest expenses of 1000, dividends of 1400. After closing these accounts on 31/12/2020, the retained earnings balance is (assume that beginning retained earnings on 1/1/2020 was zero): Select one: a. 23200 O b. 24600 O c. 23600 d. 20600