<how to solve this question>

I have a problem to do price data and i don't know to insert it into the coding

this is question

this is the coding that i have made

<?php

$page_title = 'Yoho Express!';

include ('includes/header.html');

?>
<form action="q2.php" method="post">
<p><h1><fieldset><legend>Enter your information in the form below:</legend></p></h1>
<p><b>Departure day:</b> 
<?php

//This programme is display in an array.
$day = array (1 =>'Select',
                  'Saturday', 
                  'Sunday', 
                  'Monday', 
                  'Tuesday',
                  'Wednesday', 
                  'Thursday', 
                  'Friday');
//the programme is display using the pull-down menu.
echo '<select name="day">';
foreach ($day as $key => $value) {
echo "<option value=\"$value\">$value</option>\n";
}
echo '</select>';

?></p>
<p><b>Departure time:</b>
<?php

//This programme is display in an array.
$time = array (1=>'Select',
                   '7:00', 
                   '10:00', 
                   '13:00', 
                   '16:00', 
                   '21:00');
//the programme is display using the pull-down menu.
echo '<select name="time">';
foreach ($time as $key => $value) {
echo "<option value=\"$value\">$value</option>\n";
}
echo '</select>';
?>
</fieldset>
 <b><p><div align="left"><input type="submit" name="submit" value="Book" /></div></b></p>
</form>

<?php
if($_SERVER['REQUEST_METHOD']=='POST'){
//handler
// Validate day
if (!empty($_POST['day'])) {
 $day = $_POST['day'];
} else {
 $day = NULL;
 echo '<p><b><font color="purple">You forgot to enter your departure day!</b></p>';
}

// Validate time
if (!empty($_POST['time'])) {
 $time = $_POST['time'];
} else {
 $time = NULL;
 echo'<p><b><font color="purple">You forgot to enter your departure time!</b></p>';
}

// Validate price
if (!empty($_POST['price'])) {
    $price = $_POST['price'];
   } else {
    price= NULL;
   }

// If everything is okay, print the message.
if ($day && $time  && $price) {
 // Print the submitted information.
  echo "<b><font color='purple'>Below are your bus ticket details </font></b></p>
 <br /><b>Day:</b>$day
 <br /><b>Time:</b>$time
 <br /><b>Price No:</b>$price";
} else {
 // One form element was not filled out properly.
 echo '<p><font color="red">Please go back and fill out the form again.</font></p>';
}
}

include('includes/footer.html');
?>