C++ หายอดขายรามและค่านายหน้า

int salse, per,total;
double sum = 0,sum_total=0;
int i = 1;
cout << "No.\t\tTotal Salse (Baht)\t\tSalse Commission" << endl;
cout << endl;
while (i>0)
{
cout << "Please Input Total Salse of #" << i << ": ";
cin >> salse;
if (salse < 0)
{
cout << i << "\t\t\t" << salse << "\t\t\t" <<"exit" << endl;
break;
}
else if(salse <10000)
{
total = 0;
cout << i << "\t\t\t" << salse << "\t\t\t" << total << endl;
cout << endl;
}
else if (salse >= 10000 && salse < 25000)
{
total = (salse * (1+0.07)) - salse;
cout << i << "\t\t\t" << salse << "\t\t\t" << total << endl;
cout << endl;
}
else
{
total = (salse * (1 + 0.1)) - salse;
cout << i << "\t\t\t" << salse << "\t\t\t" << total << endl;
cout << endl;
}
sum = sum + salse;
sum_total += total;
i++;
}
cout << endl;
cout << "\t\t\tTotal of salses" << endl;
cout << i-1 << "\t\t\t" << sum << "\t\t\t" << sum_total << endl;