Where is the '!' button on the TI 84 plus calculator?

SOURCE: Locate % button

There is no % button on the calculator, but depending on what you need it for, there are some simple basic programs that could work for this. If you just want to find percent from a fraction or decimal, use this one.
Hit the program button and press right two times the enter to get a new program.
Name your program "PERCENT"
hit enter
hit program, right, enter, to paste "Input" onto your screen
In quotes, put "Number?", then a comma, then N (not in quotes)
Press enter to get to a new line.
Enter "100N-->N" (once again, not in quotes)
The arrow is found directly above the on button
Press ENter again, putting you on the third line.
Hit program, right, 3 to paste Disp on your screen.
Put N after, not in quotes

Your screen should look like this:

PROGRAM:PERCENT
:Input "NUMBER",N
:100N-->N
:Disp N

Press 2nd Mode to quit, then hit the program key and select program Percent to run (making sure you are in the "Exec" menu)
Hit enter to run your program: it should turn decimals or fractions to percents.
Don't feel that your intelligence is being insulted by me giving explicit instructions that may be below your level in programming: I did not know whether or not you were proficient.

SOURCE: TI-84 Plus Calculator will not turn on, says ram is cleared

Thats because the OS is corrupt. Follow the manual and reload the OS, try the 2.43 OS

SOURCE: Find the antilog on the TI-84 Plus for finding pH in chemistry problems

I'm not specifically familiar with the TI83 or TI84 but I've used a lot of TI calculators in my time, so I'll give it a try. If your trying to find the antilog of a number in base 10 enter the number and hit the (10 to the X) button. If you're trying to find the antilog of a number in in base e (natural log), enter the number and hit the (e to the X) button.

SOURCE: antilog for ti-84 plus silver edition calculator

"2nd" + "log"