$priceOfTheHome = $_POST["priceOfTheHome"];
$downPaymentAmount = $_POST["downPaymentAmount"];
$durationOfReplay = $_POST["durationOfReplay"];
$interestRate = $_POST["interestRate"];
$priceOfTheHome
echo "<P>Price of Home: number_format($priceOfTheHome, 2, '.', ',')</P>";
echo "<P>Down payment: number_format($downPaymentAmount, 2, '.', ',')</P>";
echo "<P>Duration: number_format($durationOfReplay, 2, '.', ',')</P>";
echo "<P>Interest: number_format($interestRate, 2, '.', ',')</P>";

$totalSimpleInterest = ($priceOfTheHome - $downPaymentAmount) * $interestRate * $durationOfReplay;
echo "<P>Total Simple Interest: number_format($totalSimpleInterest, 2, '.', ',')</P>";

$totalPriceOfHome = $priceOfTheHome + $totalSimpleInterest;
echo "<P>Total Price of Home: number_format($totalPriceOfHome, 2, '.', ',')</P>";