Average rate of return with uncertainty

none3noIn investment appraisal, uncertainty can be managed through intervals or fuzzy numbers. The arithmetical properties and the extension principle are well established and can be successfully applied in a rigorous way. The investments ranking is preferably performed when the decision maker dispone of an interest Keywords: investment appraisal, Interval Arithmetic, Fuzzy Number Arithmetic.noneM.L.Guerra; C.A. Magni; L.StefaniniM.L.Guerra; C.A. Magni; L.Stefanin