Making program more efficient

[dnique65]

I wanted to get some feedback on a program I just finished. It's pretty much a cash register and I wanted to know if there is a more efficient way to determine how change is given back(dollars, quarters, dimes, ect...)

  #include <iostream>
#include <iomanip>

using namespace std;

int main()
{
    // initiated variables
    double amountOwed = 0.0;
    double amountPaid = 0.0;
    int dollarBills = 0;
    int quarters = 0;
    int dimes = 0;
    int nickels = 0;
    int pennies = 0;
    double amountStillOwed = 0.0;
    double amountOfChange = 0.0;

    // enter variables
    cout << "How much was owed?" << endl;
    cin >> amountOwed;
    cout << "How much was paid?" << endl;
    cin >> amountPaid;

    // calculate whether there is an amount still owed or amount of change ad display it
    if (amountOwed > amountPaid)
    {
        amountStillOwed = amountOwed - amountPaid;
        cout << "This is the amount still owed: $" << amountStillOwed << endl;
    }
    else
    {
        amountOfChange = amountPaid - amountOwed;
        cout << "This is the amount of change: $" << amountOfChange << endl;
    }

    // if statements determine how the change is given back
    if (amountOfChange >= 1.00)
    {
        dollarBills = amountOfChange / 1.00;
        amountOfChange -= (dollarBills * 1.00);
    }

    if (amountOfChange >= .25)
    {
        quarters = amountOfChange / .25;
        amountOfChange -= (quarters * .25);
    }

    if (amountOfChange >= .10)
    {
        dimes = amountOfChange / .10;
        amountOfChange -= (dimes * .10);
    }

    if (amountOfChange >= .05)
    {
        nickels = amountOfChange / .05;
        amountOfChange -= (nickels * .05);
    }

    if (amountOfChange >= .00)
    {
        pennies = amountOfChange / .01;
        amountOfChange -= (pennies * .01);
    }

    // displays the amount and type of change
    cout << "This is the change that should be returned: " << endl;
    cout << "Dollar bills: " << dollarBills << endl;
    cout << "Quarters: " << quarters << endl;
    cout << "Dimes: " << dimes << endl;
    cout << "Nickels: " << nickels << endl;
    cout << "Pennies: " << pennies << endl;

    return 0;
}