a. Calculate the IRR for each of the three cash-flow diagrams that follow. Use EOY zero for (i) and EOY four for (ii) and (iii) as you conclude about "reference year shift" and "proportionality" issues of the IRR method? b. Calculate the PW at MARR = 9% per year at EOY zero for (i) and (ii) and EOY four for (ii) and (iii). How the reference points in time. What can compare? do the IRR and PW methods Click the icon to view the cash-flow diagrams. Click the icon to view the interest and annuity table for discrete compounding when the MARR is 9% per year