Carlos' Car Detailing, Inc. has the following balances at the end of December 31, 2020. What is the balance of retained earnings at December 31, 2020? Car detailing revenue = 275,000 Common stock issued = $325,000 Dividends paid = $40,000 Retained earnings Jan 1, 2020 = $300,000 Total car detailing expenses = $150,000 Unearned revenue for car detailing = $45,000 O a. $430,000 O b. $260,000 O C. $385,000 O d. $280,000