There Are Three Jobs to Be Done and Three Resources

Short Answer

There are three jobs to be done and three resources with which to do them. Each resource will cost a specific amount to do each job, as shown in the following table:
$$\begin{array} { l c c c } & & { \text { Machine } } \\\text { Job } & \text { A } & \text { B } & \text { C } \\\hline 1 & \$ 6 & 9 & 4 \\2 & 4 & 4 & 3 \\3 & 8 & 7 & 4\end{array}$$ What is the total cost for the optimum assignment of jobs to machines?