Calculate the account balances for the following accounts: \begin{tabular}{|r|r|r|} \hline \multicolumn{2}{|c|}{ Service Revenue } & \\ \hline Dr. & Cr. \\ \hline & 7,980 \\ \hline & 2,690 \\ \hline & 3,780 \\ \hline \end{tabular} eTextbook and Media Save for Later