\begin{tabular}{|c|c|c|c|c|c|} \hline Revenues & Variable Costs & Fixed Costs & Total Costs & Operating Income & Contribution Margin Percentage \\ \hline$1,000 & & $300 & & & 50% \\ \hline \end{tabular} 6. \begin{tabular}{|c|c|c|c|c|c|} \hline Revenues & Variable Costs & Fixed Costs & Total Costs & Operating Income & Contribution Margin Percentage \\ \hline$1,100 & $800 & & $1,100 & & \\ \hline \end{tabular} 7. \begin{tabular}{|c|c|c|c|c|c|} \hline Revenues & Variable Costs & Fixed Costs & Total Costs & Operating Income & Contribution Margin Percentage \\ \hline$1,000 & $800 & & $1,000 & & \\ \hline \end{tabular} 8