// Purchase 
#include <iostream>
using namespace std;
int main()
{ int quantity;
  double cost, subtotal, tax, total;
  cout<<"Enter cost of item: ";
  cin>>cost; // user types in cost
  cout<<"Enter quantity: ";
  cin>>quantity;
  subtotal = cost * quantity;
  tax = subtotal * .04; //tax rate varies between states 
  total = subtotal + tax;
  cout<<"Total cost = $"<<total<<"\n"; 
  //don't worry about format for now
  return 0;
} //main