Please help with a custom javascript

Question

Hello,
I am a military instructor, and I am trying to create a grade report card with Acrobat X Pro.  So far I have made good progress with the help of the forum community (just searching through the pages and pages of posts), but I am stuck on this issue.
Like I stated,  I am creating a report card (of sorts) where our other instructor staff can input student test grades into the fields as they [students] progress through training.  The form is showing the particular test with an input field for the grade.  Lastly, the student's overal GPA is displayed in percent format.
My conundrum: I am trying to code a field that all a user [instructor] will have to input is a numerical value with or without a decmil, and the field will display it as a percentage. 
If I use acrobats default percentage, the number entered into the field will be multiplied by 100 (i.e. I enter 90 and acrobat displays 9000% in the field).
I would just like to be able to type in 90, and 90% be displayed; or type in 88.5, and 88.5% be displayed.
With the scripts I have entered, no decmils can be displayed, and the overal score is multiplying the average by 100, thus if I entered the number 90 in the first exam, the average calculates to 9000%.
I am assuming the custom format script and custom keystroke script made the average calculation script not work correctly.
Thanks in advance.  Ryan
I have entered the following javascripts:
1.  Document Level Script
// Document-level function
function DigOnlyKS() {
    // Get all that is currently in the field
    var val = AFMergeChange(event);
    // Reject entry if anything but digits
    event.rc = AFExactMatch(/\d*/, val);
2.  Custom Format Script
// Custom Format script for text field
if (event.value) event.value += "%";
3.  Custom Keystroke Script
// Custom Keystroke script
DigOnlyKS();
4.  Custom Calculation Script for an Overal Grade Average
event.value = myAverageFunction(["pk1","pk2","pk3","pk4","pk5","pk6","pk7","pk8","pk9","pk10","pk11","p k12","pk13","pk14","pk15","pk16","pk17","pk18","pk19","pk20","pk21","pk22","pk23","pk24"," pk25"]);
function myAverageFunction(aNames) {
    // n = number of fields that have a numerical value
    // sum = some of values for the named fields
    var n = 0;
    var sum = 0;
    var v;
    // loop through array of name strings
    for (i = 0; i < aNames.length; i++) {
      v = this.getField(aNames[i]).valueAsString;
      // check for not a null string and not a space  and not is Not a Number
      if (v != "" & v != " " & isNaN(v) == false) {
         n++; // increment count
         sum += Number(v); // add to sum
    return (n != 0) ? (sum / n): "";

Answer 1

Try,
I'm sorry for being so ignorant with javascript.
I placed that code in the custom keystroke like you suggested, but it did not work.    Is there a specific way I need to input that code in the custom keystroke area?
I then tried to put it in the document level code and replaced (/\d*/, val) with your code... that really screwed thing up.
So now I am stuck where I was before.
I will try and show you what I am trying to accomplish:
Right now, this is what is happening
Exam 1
Exam 2
Exam 3
Final Average
95.5%
95.3%
94.3%
95.033333%
What I would like to do is to limit each field to 2 decmil places.
Each "exam field" has the following:
The "final average" field has the following:
and this is in the custom calculations area of the "final average" field:
Finally, I have this in the Documet JavaScripts area:
I have a feeling this is an easy fix, but I just cannot figure it out.
Thanks,
Ryan