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s. Carrie Mathison plans to retire in 30 years. She intends to contribute the same amount of money each year to her retirement fund. The fund earns 10% compounded annually. She would like to withdraw $100,000 each year for 20 years, starting one year after the last contribution is made. How much money should she contribute to her fund each year? 6. A new rail car costs $100,000 and is expected to last for twenty years, assuming that $20,000 is spent on a major overhaul at the end of year 10. Routine servicing and maintenance are expected to cost $2,000 per year. The car is expected to be used in revenue service for 300 days per year. What is the equivalent cost per-day-in-use over the twenty-year life of the car, assuming a discount rate of 10%? 7. An industrial firm uses an economic analysis to determine which of two different machines to purchase. Each machine is capable of performing the same task in a given amount of time. Assume the minimum attractive rate of return is 8%. Use the following data in this analysis. Initial cost Estimated life Salvage value Annual maintenance cost $150 Machine x Machine y $6000 S12,000 7 years 13 years none $4000 $175 Which, if either of the two machines should the firm choose based on equivalent uniform annual costs