b. Billed a customer $2,100 for repair services just completed. Payment is expected in 45 days. c. Wrote a check for $860 of rent for the current month. d. Received $390 cash on account from a customer for work done last month. e. The company incurred $420 in advertising costs for the current month and is planning to pay these costs next month. Prepare a statement of retained earnings. If there are no dividends, include a b. Billed a customer $2,100 for repair services just completed. Payment is expected in 45 days. c. Wrote a check for $860 of rent for the current month. d. Received $390 cash on account from a customer for work done last month. e. The company incurred $420 in advertising costs for the current month and is planning to pay these costs next month. Prepare a statement of retained earnings. If there are no dividends, include a