var cashRegister = {
    total: 0,
//insert the add method here
    add: function(itemCost){
        this.total += itemCost; // this.total = this.total + itemcost


    scan: function (item) {
        switch (item) {
        case "eggs":
            this.add(0.98);
            break;

        case "milk":
            this.add(1.23);
            break;

        //Add other 2 items here
        case "magazine":
            this.add(4.99);
            break;

        case "chocolate":
            this.add(0.45);
            break;

        }
        return true;
    }
};

//Scan 2 eggs and 3 magazines
scan("eggs","eggs","magazine","magazine","magazine");
//Show the total bill
console.log('Your bill is '+cashRegister.total);