5/7 help please


#1

Hi, i don't uderstant or my code is not good ?
his says : Your bill is 3.1500000000000004

cashRegister = {
    total:0,
    lastTransactionAmount:0,
    //Dont forget to add your property
    add: function(itemCost) {
        this.total +=  itemCost;
        this.lastTransactionAmount= itemCost;
    },
    voidLastTransaction: function(){
        this.total = this.total = this.lastTransactionAmount;
    },
    
    
    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
    
    
};

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

Hi this line

this.total = this.total = this.lastTransactionAmount;

you ahev two = change the one after this.total to -


#3

Did you mean to write,

this.total = this.total - ...

which can also be written,

this.total -= ...

#4

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