JavaScript .each not working to separate sections

I'm trying to create a number field (.item_adults) that multiply it self and print the value into a class="item_price". To do that I create some of this:

<div class="bookSection">
  <input class="item_adults" name="adults" type="number" data-price="10" value="1" maxlength="2" min="0">
  <p>Subtotal: $<span class="item_price">10</span></p>
</div>

$( document ).ready(function() {
    $(".bookSection").each(function() {
        $(".item_adults").change(function(){
            var price = ($(this).val());
            var ammount = ($(this).attr("data-price"));
            var total = (price) * ammount;
            $(".item_price").html(total);
        });
    });
});
<script src="https://code.jquery.com/jquery-2.2.4.js"></script>

<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<div class="bookSection">
  <input class="item_adults" name="adults" type="number" data-price="10" value="1" maxlength="2" min="0">
  <p>Subtotal: $<span class="item_price">10</span></p>
</div>
  
<div class="bookSection">
  <input class="item_adults" name="adults" type="number" data-price="15" value="1" maxlength="2" min="0">
  <p>Subtotal: $<span class="item_price">15</span></p>
</div>

</body>
</html>
Answer:1

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