7/7 NaN


7/7 Building a cash register- You deserved it!

The code seems to work over all, but the browser is printing "Your bill is NaN."
I also get an error message saying "Oops, try again: false"

function StaffMember(name, discountPercent){
    this.name = name;
    this.discountPercent = discountPercent;

var sally = new StaffMember("Sally",5);
var bob = new StaffMember("Bob",10);

// Create yourself again as 'me' with a staff discount of 20%
var me = new StaffMember("jocelyn", 20);

var cashRegister = {
    lastTransactionAmount: 0,
    add: function(itemCost){
        this.total += (itemCost || 0);
        this.lastTransactionAmount = itemCost;
    scan: function(item,quantity){
        switch (item){
        case "eggs": this.add(0.98 * quantity); break;
        case "milk": this.add(1.23 * quantity); break;
        case "magazine": this.add(4.99 * quantity); break;
        case "chocolate": this.add(0.45 * quantity); break;
        return true;
    voidLastTransaction : function(){
        this.total -= this.lastTransactionAmount;
        this.lastTransactionAmount = 0;
    // Create a new method applyStaffDiscount here
    applyStaffDiscount: function(employee){
        this.total -= this.total * ( employee.discountPercent/ 100);

// Apply your staff discount by passing the 'me' object 
// to applyStaffDiscount

// Show the total bill
console.log('Your bill is '+cashRegister.total.toFixed(2));


In your function call


you are using a string Value "me" as an argument
whereas you required argument should be an object
which you assigned to the variable me

Try it by using



You are a beautiful human being!!! That was it. Thanks! I thought I was doing math wrong.