A new computer system will require an initial outlay of $18,750, but it will increase the firms cash flows by $4,200 a year for each of the next 6 years.

a. Calculate the NPV and decide if the system is worth installing if the required rate of return is 8%. (Negative amount should be indicated by a minus sign. Do not round intermediate calculations. Round your answers to 2 decimal places.)

b. Calculate the NPV and decide if the system is worth installing if the required rate of return is 13%. (Negative amount should be indicated by a minus sign. Do not round intermediate calculations. Round your answers to 2 decimal places.)

c. How high can the discount rate be before you would reject the project? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.)