4-17. Assuming monetary benefits of an information system at $85,000 per year, one-time costs of $75,000, recurring costs of $35,000 per year, a discount rate of 12 percent, and a five-year time horizon, calculate the net present value of these costs and benefits of an information system. Also calculate the overall return on investment of the project and then present a break-even analysis. At what point does break-even occur?

4-19. Change the discount rate for Problem and Exercise 4-17 to 10 percent and redo the analysis.

4-20. Change the recurring costs in Problem and Exercise 4-17 to $40,000 and redo the analysis.

4-21. Change the time horizon in Problem and Exercise 4-17 to three years and redo the analysis.