3/7 error


#1

What's wrong with this code? Got the error: Calling cashRegister.add(3.2) set the cashRegister.total to 0 instead of 3.2

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

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

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

    case "magazine": 
        this.add(4.99);
        break; 

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




    }
    return true;
}

};

//Scan 2 eggs and 3 magazines
cashRegister.scan("eggs");
cashRegister.scan("eggs");
cashRegister.scan("magazine");
cashRegister.scan("magazine");
cashRegister.scan("magazine");

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


#2

Hi this part this.total+- itemCost; you put "-" instead of "="