
Originally Posted by sxtg
5% of 50 happens to be 2.5 which would mean the answer to 50+5% of 50 would be 52.5 rather it be "true" "basic" "financial" "advanced" or blah blah blah....EVEN a FOURTH grader knows that.
Problem is people are NOT inputting 50+5%of 50, they are putting in 50+5% and expecting 52.5. I did fix the post to correct some words that were left out originally. It should be clearer now.
I do math all day long to make a living and taught my first engineering course 30 years ago. I don't want to belabor the point but I have about as much time in on calculators as a carpenter does on a hammer. I have over a dozen calculators on the 3 desks closest to me ranging from "business cards" to promotional desktop things to stuff I actually bought to design buildings, plants and bridges with. I have used the purchased ones on everything from the Verrazzano Bridge to 160 million gallon per day pumping stations and for the basis of over 75 court cases where I have served as an expert witness. The ones under $10 all take 50 + 5 % and give ya 52.5 All the ones who don't have some salesman's card stuck to it give the same answer the Treo does when in "math" mode. I have one financial calculator in the office and it's one of those noisy things with the tape that annoys the bejeezes outta me so I refuse to use it. I won't pretend to know the basis of how they work. OTOH, my bookkeeper won't use anything else cause mine "don't make sense" to her.
The fact remains that:
50 + 5 % is the same as 50 + 5/100 which, no matter how ya slice it, unless you stick another number in there after the %, is still 50.05 If vendors want to make calculators so store clerks can add sales tax to clothes purchases without typing in some extra numbers that 's fine. No one said they had to follow heirarchal math rules. But that doesn't mean we should criticize vendors that make calculators that do meet these rules.
The reason that many scientific / math calculators, including the Treo, don't have % buttons is that scientists and engineers don't use % very often. Rather than saying we are adding a 40% cushion, we say the safety factor is 1.4....a practice which I must admit probably originated from the days before calculators when slide rules ruled and scientists / engineers saw 1,400 as 1.4 x 10^2
While the Advanced Math Treo calculator conforms, in all respects that I have seen, with heirarchal math rules, the "Basic" Treo calculator doesn't subscribe to these "math rules" as it is a step by step calculator and pays no attention to heirarchal math order. Why PalmOne included the basic calculator in the first place is beyond me. A tool of that simplicity doesn't belong on a device of this nature. I have no idea of how the financial calculators work as that's one for the bean counters and not us nerdy types.


