JQuery - Increase value output for each 50 entered -

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i've got simple text box users enter number - update multiple elements on page value.

at moment script multiple number entered set amount. 

    $('input').keyup(function() {         var v = $(this).val();         v = isnan(v)?'':v;         $(this).val(v);         $("#spot1 span").html(v * 100);         $('#spot2 span').html(v * 200);     });

html:

    <div><input id="number" name="number" type="text"><br /></div>      <div id="spot1">section 1:  <span></span><br /></div>     <div id="spot2">section 2:  <span></span><br /></div>

what have output section 2 based on increasing in digest times x entered input box

eg. less 50 section 2 shows 1, , every 50 entered increases 1. so, if number 250 entered, section 2 show 4

use division in-line, try sample entering in '250'

$('input').keyup(function() {          var v = $(this).val();          v = isnan(v)?'':v;          $(this).val(v);          $("#spot1 span").html(v);          $('#spot2 span').html(math.ceil((v * 4)/250));      });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <div><input id="number" name="number" type="text"><br /></div>        <div id="spot1">section 1:  <span></span><br /></div>      <div id="spot2">section 2:  <span></span><br /></div>


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