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This script from your tutorial not working
var Classes = Number(Apperyio("Classes").val());
var percentage = Number(Apperyio("percentage").val());
var Bunklimit = Classes ;
var BunkPercentage = Percentage ;
Apperyio('Bunklimit').text('$' + Bunklimit.toFixed(2));
Apperyio('BunkPercentage').text('$' + BunkPercentage.toFixed(2)); 
Hello!
Could you please provide us with the link to this tutorial?
Missing capital P on var percentage (var Percentage) ?
Please try next code which is wrapped with try ... catch statement:
pretry{
var Classes = Number(Apperyio("Classes").val());
var percentage = Number(Apperyio("percentage").val());
var Bunklimit = Classes ;
var BunkPercentage = Percentage ;
Apperyio('Bunklimit').text('$' + Bunklimit.toFixed(2));
Apperyio('BunkPercentage').text('$' + BunkPercentage.toFixed(2));
} catch(ex){
alert("Exception"+ex);
}/pre
Also you may open console to see if there were any exceptions during runtime