#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
    int numSold;
    double total;
    const double PRICE = 99.00,
                 DISCPRICE20 = 79.20,
                 DISCPRICE30 = 69.30,
                 DISCPRICE40 = 59.40,
                 DISCPRICE50 = 49.50;
    bool invalidNum = false;

    cout << fixed << showpoint << setprecision(2);

    cout << "Enter the number of units sold: ";
    cin >> numSold;

    
    if (numSold <= 0)
        invalidNum = true;
    if (invalidNum)
        cout << "You must enter a number greater than zero.\n";

    else if (numSold < 10 && numSold >= 1)
    {
        total = numSold * PRICE;
    }
    else if (numSold >= 10 && numSold <= 19)
    {
        total = numSold * DISCPRICE20;
    }
    else if (numSold >=20 && numSold <= 49)
    {
        total = numSold * DISCPRICE30;
    }
    else if (numSold >= 50 && numSold <= 99)
    {
        total = numSold * DISCPRICE40;
    }
    else if (numSold >= 100)
    {
        total = numSold * DISCPRICE50;
    }

    cout << "Your total is: " << total << endl;
        return 0;
}

int numSold = 0;
    double total = 0;

int sum(int a, int b){
  retrn a+b;
}
int main(){
  int test = sum(5, 6);
  return 0;
}