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In a design, you have the choice of purchasing one of the following batch reactors: table [ [ , A , B , C

In a design, you have the choice of purchasing one of the following batch reactors:
\table[[,A,B,C],[Material of construction,Carbon steel,Stainless steel,Hastalloy],[Installed Cost ($),15,000,25,000,40,000],[Equipment Life (y),3,5,7],[Yearly Maintenance Cost ($y),4,000,3,000,2,000]]
If the internal rate of return for such comparisons is 9% p.a., which of the alternatives is least costly?
2. Sooner Manufacturing is considering updating the lighting in its factory to more energy-efficient LED fixtures. After extensive research, two alternatives remain. The first one costs $20,000 and will save the company $4,000 per year in electricity costs; the second one costs $25,000 and will save the company $6,000 per year in electricity costs. The company estimates that these fixtures will last for 10 years. If the company's discount rate is 8%, which option should they choose? (Note: you may consider yearly savings as positive cash flow for this analysis.)
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