Help me please.

A business owner is considering between two alternative actions of expansion of facilities (E) and non expansion (N). Each has the following estimated probabilistic cash flow Alternative Outcomes Year 0 Year 1 Year 2 Year 3 Year 4 El E2 Prob = 1.0) (Prob= 0.4) | (Prob= 0.6 -60,000 +20,000 +20,000 +20,000 +30,000 60,000 +25,000 +20,000 +15,000 +15,000 0 0 a) For a rate of return 5%, which action should you take? Justify your answer b) For a rate of return 10%, which action should you take? Justify your answer. c) What is the internal rate of return for this investment? What is its implication