Exercise 7.4: (10 pts) How much would you need to save annually to be willing to invest $1.75 million in a process improvement? The internal hurdle rate (interest rate) for process improvements is 18% before taxes over 8 years. Exercise 7.4: (10 pts) How much would you need to save annually to be willing to invest $1.75 million in a process improvement? The internal hurdle rate (interest rate) for process improvements is 18% before taxes over 8 years