Bleep Bleep....Please help


#1



Replace this line with your code. 
var cashRegister = {
    total:0,
    //Dont forget to add your property
    add: function(itemCost) {
        this.total +=  itemCost;
       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;
    },
    //Add the voidLastTransaction Method here
    voidLastTransaction: function(){
        this.lastTransactionAmount -= this.total;
    }
    
    
};
cashRegister.scan("eggs", 1);
cashRegister.scan('eggs',1);
cashRegister.scan('milk',1);
cashRegister.scan('magazine',1);
cashRegister.scan('chocolate',4);

//Void the last transaction and then add 3 instead

cashRegister.voidLastTransaction();
cashRegister.scan("chocolate",3)
//Show the total bill
console.log('Your bill is '+cashRegister.total);


#2

It looks like you have the function voidLastTransaction in the wrong order. I believe it should be

this.total -= this.lastTransactionAmount;