
Originally Posted by IsLNdbOi
I'm talking about what the original poster said:
10 + 8% =
...and the answer I get is 0.18
I use the % button a lot and if the Treo650 doesn't give the correct answer when you use x + y%, then it's not working correctly, thus another "shortcoming".
No, as I said, different calculators work different ways. On some calculators, 10 + 8 x .01 would be 10.08 and on others .18. The "%" key is a particular problem in this area if it is not used correctly  as in "10 + 8 %" and expecting 10.08  sometimes you'll get that, sometimes you won't, depending upon the calculator involved.
A basic calculator, as the one being discussed here, usually processes each operation as you go, thus 10 + 8 % would be .18 because the "10 + 8" is processed first. More advanced calulators, as even this one in "advanced" mode, process operations using normal precendence of multiplication over addition, so, for 10 + 8 %, the "%" operation is processed before the addition  though the "%" operator is missing in the advanced calculator and you actually have to know how to do this using 10 x 1.08 to get the right answer.
That's the way it is and it is NOT an error or shortcoming, it's a lack of understanding in how calculators work.
It's worth noting that on calculators that give you 10.08, they would also give you 11.08 if you did 11 + 8%, which would NOT be what you want if you are trying to get to 11 + 8 percent of 11. In this case, the use of the "%" key is incorrect.
The CORRECT way to do this problem is 10 x 8 % + 10. This gives you 10.08 on ANY calculator. 10 +8% is simply the wrong way to enter this problem, as I showed with the example of using "11" instead of "10."
The fact that "10 + 8 %" gives you 10.08 on some calculators is purely fortuitous because you happened to choose "10" as your base number  other numbers give "incorrect" answers. The answers are all correct, of course, once you understand how the calulator is working.


