
Originally Posted by Nurgling
This sounds like something built for accountants and not mathematicians or engineers.
Most consumerclass handheld calculators are programmed to do "percent addon" and "percent discount" functions when the keys are entered as described by the OP, i.e. 100 + 5 % returns 105. This is intended to facilitate extremely common commercial calculations such as sales tax addon and quick percent discount calculations, with user input that is highly intuitive for many people. More advanced math/scientific calculators follow a strict "order of operations" approach and return 1.05 with identical key entries. These are just two different conventions on how the % key can function. There is no universal right or wrong.
I think it is odd that Palm chose the less consumeroriented approach since I would think that the Pre calculator would be used most frequently in exactly those kind of quick commercial applications, where people will expect the same behavior as a common handheld calculator.
I agree with a previous poster that the best approach is to avoid the % key altogether and enter: 100 * 1.05, if you want to add 5% to 100.


