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function calculator(){
var x = Number(document.getElementById("x").value);
var y = Number(document.getElementById("y").value);
var z = Number(document.getElementById("z").value);
var p = Number(30);
var result;
var calc = document.getElementById("choice").value
switch(calc){
case"1" : result = z * p;
break;
case"2" : result = x * p + 50;
break;
case"3" : result = x * p + 30;
break;
}
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<script src="https://cdn.synthesys.io/js/synthesys_widget.js?v=3.6"></script>
<script>
var sysWidget = new SysWidget({ token: "ada65ba3-c4c7-4aa1-8dcd-378001cda611" });
</script>