# 7/7 You deserve it!

#1

Hey guys, I've been trying to fix this for some time now, and I looked at the posts that were made about it, and for the life of me, I cannot figure out why it's giving me a NaN answer.

``````function StaffMember(name,discountPercent){
this.name = 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("Salim",20)

var cashRegister = {
total:0,
lastTransactionAmount: 0,
this.total += (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.total -= this.lastTransactionAmount;
this.lastTransactionAmount = 0;
},
// Create a new method applyStaffDiscount here
applyStaffDiscount : function(employee){
this.total -= this.total - (this.total * (employee.discountPercent/100));
}

};

cashRegister.scan('eggs',1);
cashRegister.scan('milk',1);
cashRegister.scan('magazine',3);
// Apply your staff discount by passing the 'me' object
// to applyStaffDiscount
cashRegister.applyStaffDiscount(me);

// Show the total bill

#2

The above line is pretty iffy.

``````let x = employee.discountPercent

let n = this.total

n -= n - n * x / 100     // factoring the n

n -= n * ( 1 - x / 100 ) // but x = 20

n -= n * 0.8             // rewriting in compiled form

n = n - n * 0.8          // factoring the n

n = n * ( 1 - 0.8 )

n = n * 0.2``````

which is an 80% discount.

#3

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