answer clearly with steps

Vodafone is considering several options for its investment strategy as it expands 5G mobile phone network infrastructure. You have the following estimations of the revenues and expenditure. Initial Investment KD 10,000,000 Sales KD 3,000,000 pa Direct Costs KD 1,200,000pa Administration KD 900,000pa Vodafone has a cost of capital of 10%. Ignore taxation Vodafone believes the machinery will have a six-year life before the next generation upgrade. a. Calculate the: Expected payback period Accounting Rate of Return Net Present Value (3 marks) (6 marks) (6 marks) Internal Rate of Return (5 marks) b. Explain and evaluate which method calculated above is most reliable, which would a firm calculate in practice? What are the challenges of conducting investment appraisal analysis? (10 marks)