Below Is Adventure Travel's Adjusted Trial Balance as of the End

Below is Adventure Travel's adjusted trial balance as of the end of its annual accounting period:
$\begin{array}{c}\text {ADVENTURE TRAVEL}\\\text { Adjusted Trial Balance }\\\text {December 31}\\\begin{array}{|l|r|l}\hline \text { Cash } & \$ 25,000 & \\\hline \text { Accounts receivable } & 15,000 & \\\hline \text { Office supplies } & 4,300 & \\\hline \text { Office equipment } & 29,600 &\\\hline\text { Accumulated depreciation - Office equipment } & & \$ 5,000 \\\hline \text { Long-term notes payable } & & 25,000 \\\hline \text { Common stock } & & 10,000 \\\hline \text { Retained earnings } & & 20,260 \\\hline \text { Dividends } & 1,000 & \\\hline \text { Fees earned } & & 75,000 \\\hline \text { Salaries expense } & 32,800 & \\\hline \text { Rent expense } & 16,800 & \\\hline \text { Depreciation expense - Office equipment } & 3,960 & \\\hline \text { Advertising expense } & 4,000 & \\\hline \text { Office supplies expense } & 2,800 & \\\hline \text { Totals } & \$ 135,260 & \$ 135,260 \\\hline\end{array}\end{array}$

a.Prepare the necessary closing entries.
b.Prepare a post-closing trial balance.