Convert percentage to decimal - actionscript-3

Question

I'm trying to convert a percent to a decimal once a button is clicked.
I have an input text field for user input and another under it, which is
a dynamic text field to just show the result after the button is clicked.
I have two classes: main and my utility class for the math.
My problem is I don't know how to call the function from
the util class in the main class to get this working.
I can't get this last part working. here is my code:
public class Main extends Sprite
{
private var pResult:TextField;
private var pResult2:TextField;
public function Main()
{
super();
// calling all the functions below
// adding my graphics to the display
var baseDBase = new PDBase();
this.addChild(base);
base.x = -70;
base.y = 30;
//changing the font format
var format:TextFormat = new TextFormat();//adding the object
format.size = 14;//font sizing
format.align = TextFormatAlign.LEFT;//font align
//result text field
pResult = new TextField();//adding the object
this.addChild(pResult);//displaying the object
pResult.border = true;//setting the border
pResult.borderColor = 0x30FF00;//setting border color
pResult.textColor = 0x000000;//setting the font color
pResult.x = 28;//position left or right
pResult.y = 70;//position up or down
pResult.width = 142;// changing width
pResult.height = 20;// changing height
pResult.type = TextFieldType.INPUT;//making sure the text area is for input
pResult.defaultTextFormat = format;//sets text format to defult
pResult.maxChars = 32;//text limit of characters
pResult.restrict = "0-9.";//fonts used only
pResult2 = new TextField();//adding the object
this.addChild(pResult2);//displaying the object
pResult2.border = true;//setting the border
pResult2.borderColor = 0x30FF00;//setting border color
pResult2.textColor = 0x000000;//setting the font color
pResult2.x = 28;//position left or right
pResult2.y = 96;//position up or down
pResult2.width = 142;// changing width
pResult2.height = 20;// changing height
pResult2.type = TextFieldType.DYNAMIC;//making sure the text area is for input
pResult2.defaultTextFormat = format;//sets text format to defult
pResult2.maxChars = 32;//text limit of characters
pResult2.restrict = "0-9.";//fonts used only
var button:Button = new Button("Calculate");
this.addChild(button);
button.x = 10;
button.y = 130;
button.addEventListener(MouseEvent.CLICK, btn_EventListener);
}
private function btn_EventListener(e:MouseEvent):void
{
MathUtil.percentToDecimal(percent)
this.pResult2.text = percent;
}
}
public class MathUtil
{
public function MathUtil()
{
}
public static function percentToDecimal(percentValue:Number):Number
{
var percent:Number = percentValue * 100;
var roundedDecimal:Number = Math.round(percent);
var percentResult:String = roundedDecimal;
return percentResult;
}
}
I'm also getting this error:
1067: Implicit coercion of a value of type Number to an unrelated type String.
On var percentResult:String = roundedDecimal;

Answer 1

this.pResult2.text = String(MathUtil.percentToDecimal(percent));
Note that your function returns a value, so if you will do this, the returned value will be assigned to textfield. "String()" is casting a returned number to string.
Edit:
Ah, and here you can use casting:
var percentResult:String = String(roundedDecimal);