Kindly explain what is wrong with my code ? I did not understand the 'applyStaffdiscount' part?


Your bill is NaN

Replace this line with your code. 
function StaffMember(name,discountPercent){ = 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("Anushree",20);

var cashRegister = {
    lastTransactionAmount: 0,
    add: function(itemCost){ += (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.lastTransactionAmount;
        this.lastTransactionAmount = 0;
    // Create a new method applyStaffDiscount here
        applyStaffDiscount : function(employee,discountPercent){ += discountPercent;

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

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


from the instructions:

Create a new method called applyStaffDiscount in the cashRegister object which accepts a parameter employee

it seems your method has two parameters instead of just the one.

you call your method here:


which means your method parameter (employee) will now hold me, so you can access the discountPercent through your function parameter:


in case of me, the discount is 20%. but if you want the percentage of something you can multiply it by 20/100

for example 20% of 250 is: 250 * (20 / 100) # answer: 50

so now we have done the math, we can subtract if from total: -= ( * (employee.discountPercent/100));


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