4. Bruin Manufacturing is evaluating whether it should reta and room or sell it immediately and purchase a current one can be kept for another 5 years, given that an ad year is provided each year. Determine whether time. Use a before-tax MARR of 15% per year. (25 points) ould retain its current environmental test chamber and purchase a new one. The relevant costs are shown below year. Determine whether the current equipment should be rep n that an additional maintenance cost of $500 each at should be replaced at this Defender Challenger 38.000 5450 Capital investment, $ Annual operating expenses, S Annual maintenance, S Current market value Estimated salvage value at the end of 5 additional years 5250 500 13,000 1500 23,000