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****PeterJohn BookKeeping Calculator; We Wanted Simple and Easy Calculator for BookKeeping. **We Needed Independent Memory, Grand Total Memory. **We Wanted AC, C, BackSpace, some of calculators doesNot have "C"(Clear Key), or some of calculators doesNot have "BackSpace" key. **We Wanted Not "MRC" But "MR" and "MC". some of calculators doesNot have the separated "MR" and "MC". "MRC" makes us confused, when we want "MR", if there's Only "MRC", we might Ms-touch "MC", when we want "MC", if there's Only "MRC", we might Mis-touch "MR". when we want "MR", just we want Not "MRC" but "MR". when we want "MC", just we want Not "MRC" but "MC". ****Basic Functions; We determined that we regard "CASIO ND-26S Professional Business Calculator", its keyboard layout and basic function...