i need retained earnings

if you could show how to do it

Equipment 60,000 Interest Expense 2,500 Interest Payable 650 Retained Earnings ? Dividends 64,230 Land 136,000 Accounts Receivable 102,000 Bonds Payable 78,000 Notes Payable (due in 6 months) 28,000 75,000 Common Stock Accumulated Depreciation - Equipment 10,000 5,200 Prepaid Advertising 350,000 Service Revenue 83,000 Buildings 1,700 Supplies 3,000 Income Taxes Payable 1,200 Utilities Expense 1,700 Advertising Expense 51,000 Salaries and Wages Expense 880 Salaries and Wages Payable 15,500 Accumulated Depr. - Building 45,000 Cash 7,500 Depreciation Expense