Help with percentages

Question

I have a form where I need to add the dollar amounts for projected small business spend and large business spend. (which is entered by the user) Then, actual cumulative smal and large spend is also entered by the user.
I need to know how to write the script for calculating the percentage of cumulative spend in relation to projected spend.
cumulative spend = % of projected spend
Projected spend = 200.00
50.00 is what % of 200.00
This is my current code:
if (TotalCurrent <> 0)
then
SmallActualCurrentPerc=(SmallActual / TotalCurrent) * 100
else
0
endif
I have a few problems:
I need to display the result as a decimal percent
I need to add code that says SmallActual <> 0 as well. How?
Please Help

Answer 1

The closest I came was:
// Custom calculation script
(function () {
    // Get the field values, as strings
    var s1 = getField("Charged").valueAsString;
    var s2 = getField("Reduction").valueAsString;
    // Perform the calculation if both fields are not blank
    // and Charged is not zero
    if (s1 && s2 && +s1 !==  0) {
        event.value = 100 * (+s1 - +s2) / +s1;
    } else {
        event.value = "";
which I got from another thread. It works, but the result tends to have a - before the number. Also when I use the formatting in acrobat and select percentage the decimal placement gets confusing. I'm creating this form for a bunch of morons in my HR department so extraneous numbers makes them confused. I need the most simplified result possible.