$27\mathrm{.}10.$ How would you determine P$4$ through P$7$ in the cost$-$benefit model presented in

Section $27\mathrm{.}3\mathrm{.}3?$

Cost$-$benefit model presented in Section $27\mathrm{.}3\mathrm{.}3$ is given below:

P$4=$ Predicted annual maintenance cost after reengineering

P$5=$ Predicted annual operations cost after reengineering

P$6=$ Predicted annual business value after reengineering

P$7=$ Estimated reengineering costs