What language are you programming in?
If you are programming in C or C++, you could do something like this:
#include <iostream>
using namespace std;
int main(void)
{
//declarations
double item1 = 0;
double item2 = 0;
double item3 = 0;
double item4 = 0;
double item5 = 0;
double subtotal = 0;
double total = 0;
double tax = 0;
//Enter Items
cout << "Please enter the price of item 1";
cin >> item1;
cout << "Please enter the price of item 2";
cin >> item2;
cout << "Please enter the price of item 3";
cin >> item3;
cout << "Please enter the price of item 4";
cin >> item4;
cout << "Please enter the price of item 5";
cin >> item5;
//Compute subtotal
subtotal = (item1 + item2 + item3 + item4 + item5 + item6);
//Compute amount of tax
tax = subtotal * (.06);
//Compute total
total = subtotal + tax;
//Display subtotal, total, and amount of tax
cout < " The subtotal of the sale is: " << subtotal << endl;
cout < " The amount of sales tax is: " << tax << endl;
cout < " The total of the sale is: " << total << endl;
return 0;
}//end of function main
I know this is a very very basic C++ program but I hope it helps and good luck on your project!