how do i calculate retained earnings

come Statement and Balance Sheet The following information for Rogers Enterprises is available at December 31, 2019, and includes all of Rogers financial statement amounts except retained earnings: Accounts recevable $72,920 Cash 13,240 62,900 Common stock (10,000 shares) Income taxes expense Income taxes payable 12,600 4,150 Interest expenso 15,500 25,000 Notes payable (due in 10 years) Prepaid rent building) 31,500 Property, plant, and equipment 90,000 Rent expense 135,000 Retained earnings Salaries expense 235,200 Salaries payable 14,890 Service revenue 463,000 Supplies 43,400 34,700 Supplies expense