Waterway Industries's contribution margin is $19 per unit for Product A and $42 for Product B. Product A requires 2 machine hours and Product B requires 4 machine hours. What is the contribution margin per unit of limited resource for each product? \begin{tabular}{|c|c|} \hline A & B \\ \hline$9.50 & $6.33 \\ \hline$46.00 & $10.50 \\ \hline$9.50 & $10,50 \\ \hline$46.00 & $6.33 \\ \hline \end{tabular}