Calculating discounts and totaling - undeclared errors

[JayneL]

I am working on the following practice project for C++, VS 2010 -
Write code for the following
A software company sells a package that retails for $99. Quantity discounts
are given according to the following table -
Quantity Discount
10-19 20%
20-49 30%
50-99 40%
100 or more 50%

Write a program that asks the user to enter the number of packages purchased.
The program should then display the amount of the discount (if any) and the
total amount of the purchase after the discount.

This will run with errors

Errors -

(25): error C2065: 'discount' : undeclared identifier
(26): error C2065: 'total' : undeclared identifier
(35): error C2065: 'discount' : undeclared identifier
(37): error C2065: 'discount' : undeclared identifier
(39): error C2065: 'discount' : undeclared identifier
(41): error C2065: 'discount' : undeclared identifier
(43): error C2065: 'discount' : undeclared identifier
(47): error C2065: 'discount' : undeclared identifier
(52): error C2065: 'total' : undeclared identifier
(52): error C2065: 'discount' : undeclared identifier
(55): error C2065: 'total' : undeclared identifier

I declared discount as zero, then did the calculations to reset for each run. It will output the discount, but will not run the total correctly.

What am I missing?

#include <iostream>
#include <math.h>
using namespace std;


int main()

{
	//set variables
	double  quantity = 0;
			discount = 0;
			total = 0;

	// require user input

	cout << "Enter the quantity for your purchase: ";
	cin >> quantity;

	// determine discount
	if (quantity <= 19)
		discount = .2;				
	else if (quantity >= 20 && quantity <= 79)
		discount = .3;
	else if ( quantity > 79 && quantity <= 99)
		discount = .4;
	else if ( quantity > 100)
		discount = .5;
	else if (quantity < 10)
		discount = 0;

	// show discount percentage

	cout << "Your discount on this purchase is " << discount << '.' << endl;

	//declare constant & calculate

	double item = 99;
	total = quantity * item - discount;

	//output total purchase
	cout << "Your total price is " << total << '.' << endl;

return 0;


}