The Following Data Were Taken from the Accounting Records of Lorenzo

The following data were taken from the accounting records of Lorenzo Company. Except where indicated, the balances are as of December 31, 2013 before closing entries have been made. $\begin{array}{|l|r|}\hline \text { Service revenue } & \$ 83,000 \\\hline \text { Retained earnings } & 47,500 \\\hline \text { Accounts receivable } & 13,250 \\\hline \text { Salaries expense } & 44,000 \\\hline \text { Operating expense } & 7,700 \\\hline \text { Accounts payable } & 11,400 \\\hline \text { Supplies expense } & 380 \\\hline \text { Prepaid rent } & 2,000 \\\hline \text { Common stock } & 45,000 \\\hline \text { Supplies } & 200 \\\hline \text { Dividends } & 1,200 \\\hline \text { Insurance expense } & 800 \\\hline \text { Rent expense } & 10,000 \\\hline \text { Unearned revenue } & 765 \\\hline\end{array}$
Required:
a) List the accounts that should be closed at the end of 2013.
b) Prepare an income statement for Lorenzo Company for 2013.
c) What is the balance in retained earnings after closing entries have been made?