The calculator in the article, the fx-cg50 is just what he needs. It's like the FX-991ex mentioned elsewhere but it remembers more things and has history and a

The calculator in the article, the fx-cg50 is just what he needs. It's like the FX-991ex mentioned elsewhere but it remembers more things and has history and a display that is decent. I own one and have been using it for a couple of years now.