much beginner-tier C++

//This program calculates the total due on sales taxes for a quarter period of the year based on the sales and jurisdiction.

#include <iostream>

using namespace std;

//Named constants
const double Local_Tax_Rate = 0.08875;
const double Credit_Perc = 0.05;

int main()
{
	//Declaring variables
	int Gross, Non_Taxable;
	int Taxable;
	double Vendor_Credit, Pen_And_Int;

	//Statements;
	cout << "Enter two integers, one for Gross, "
		<< "one for Non-Taxable: ";		//Step 1
	cin >> Gross >> Non_Taxable;		//Step 2
	cout << endl;
	cout << "Enter the penalties and interest due at this time: ";
	cin >> Pen_And_Int;
	cout << endl;

	cout << "The numbers you entered are " << Gross
		<< " for Gross Sales and " << Non_Taxable
		<< " Sales exempt from " << endl;
	cout << " Taxes." << endl;
	cout << " Penalties and Interest = " << Pen_And_Int
		<< endl;			//Step 3
	cout << "The Taxable total of the Sales for this quarter is = " << Gross - Non_Taxable
		<< endl;
	cout << "The pre-tax for this quarter is = " << (Gross - Non_Taxable) * Local_Tax_Rate
		<< endl;
	cout << "The amount to be credited to the vendor for this quarter is = " << (Gross - Non_Taxable) * (Local_Tax_Rate) * Credit_Perc
		<< endl;
	Vendor_Credit = (Gross - Non_Taxable) * (Local_Tax_Rate)* Credit_Perc;
	cout << "The final calculation of the sales taxes due is = " << (Gross - Non_Taxable) * (Local_Tax_Rate)+(Pen_And_Int)-(Vendor_Credit)
		<< endl;


	system("pause");
	return(0);
}