I need a script for Acrobat Form Field calculation

I have a form with a Goup1 Radion Buttons, Wage and Classified. When Classified is selected I want a calculation in the Field "Semi Monthly" that takes Field "Salary" and divides by 24. 

This is what I started with:

var classified = this.getField("Field Classified").value;
var salary = this.getField("Field Salary").value;

if (classified === "Yes") {
    event.value = salary / 24;
} else {
    event.value = ""; // Blank if not classified
}