Which of the following set of calculations must be erroneous if the required rate of return for all the projects is 10%? 14 PaybackNPV@ 10% period 3 years 4 years 3 years 4 years Profitability IRR 13.0% 8.0% 10.0% 12.0% Project $1,200 $1,500 $%1,800 $800 ndex 1.1 0.8 1.0 0.9 A Project C B Project R C Project E D Project A