Greetings I am developing an Android App that is a simple calculator of 
several fields. I am new to programming so I keep getting stuck at one of 
my lines of code. I have already set up the design and added my 
declarations to the label. Now I am trying to write the initial script of 
which will actually computer my formula. The formula lies within the button 
labeled " Calculate" Here is what I have thus far. Please give some advice 
on how you would approach this type of formula. 

<?xml version="1.0" encoding="utf-8"?>
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009"; 
xmlns:s="library://ns.adobe.com/flex/spark" title="Percentage Calculator">
 <fx:Script>
<![CDATA[
protected function btnCalculate_clickHandler(event:MouseEvent):void
{
// TODO Auto-generated method stub * Insert Formula Here *
get
}
]]>
</fx:Script>
 <fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<s:Label id="lblBillAmount" x="7" y="80" text="Bill Amount : "/>
<s:TextInput id="txtBillAmount" x="103" y="69" width="155"/>
<s:Label id="lblTipPercent" x="7" y="121" text="TipPercent%"/>
<s:TextInput id="txtTipPercent" x="105" y="111" width="155"/>
<s:Label id="lblAnswer" x="85" y="208" width="189" height="36"/>
<s:Button id="btnCalculate" x="135" y="248" label="Calculate"
  click="btnCalculate_clickHandler(event)" color="#063EB1" 
fontFamily="_typewriter"/>
<s:Label id="lblTipAmount" x="7" y="164" text="TipAmount$"/>
<s:Label id="txtTipAmount" x="105" y="152" width="155" height="33"/>
</s:View>

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