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    <p>You have functions in your increment.js script that change the value of the input after you get them in "myfuntion". You need to calculate the prices after the values are changed.</p> <p>So first you should <strong>remove</strong> the lines below from this file: </p> <p><a href="http://alpha.kentishtours.co.uk/assets/scripts/increment.js" rel="nofollow">http://alpha.kentishtours.co.uk/assets/scripts/increment.js</a></p> <pre><code>$("#increase").click(function(){ var $n = $("#adult"); $n.val(Number($n.val())+1); }); $("#decrease").click(function(){ var $n = $("#adult"); $n.val(Number($n.val())-1); }); $("#increasec").click(function(){ var $n = $("#child"); $n.val(Number($n.val())+1); }); $("#decreasec").click(function(){ var $n = $("#child"); $n.val(Number($n.val())-1); }); </code></pre> <p>Also remove the <code>onClick="myFunction()"</code> attribute in your HTML form.</p> <p>Then change all your myFunction script to this:</p> <pre><code>var adult = $('#adult'), child = $('#child'), total = $('#total'), value = $('#value'), increase = $('#increase'), decrease = $('#decrease'), increasec = $('#increasec'), decreasec = $('#decreasec'); var calulate_price = function(a, c){ var p1 = 39, p2 = 30, PA = a * p1, PC, d; if(a &gt;= 1) PC = c * p2; else PC = c * p1; d = PA + PC; total.text(d); value.val(d); }; increase.click(function(){ var a = Number(adult.val()); var c = Number(child.val()); adult.val(++a); calulate_price(a, c); }); decrease.click(function(){ var a = Number(adult.val()); var c = Number(child.val()); adult.val(--a); calulate_price(a, c); }); increasec.click(function(){ var a = Number(adult.val()); var c = Number(child.val()); child.val(++c); calulate_price(a, c); }); decreasec.click(function(){ var a = Number(adult.val()); var c = Number(child.val()); child.val(--c); calulate_price(a, c); }); </code></pre> <p>Everything working: <a href="http://jsbin.com/ohUniCa/2/edit?js,output" rel="nofollow">http://jsbin.com/ohUniCa/2/edit?js,output</a></p>
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    1. COHello, the price is calculated when a user presses one of the "+" or "-" buttons, using `onClick="myFunction"` It takes the value that is in the text boxes and multiplies them by the price of a ticket.
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    2. COI did not understood this : ` if(a >= 1) { a=+30; } ` . Is there a diferent price for children or it's more expensive for a single person? Plz explain how you are taxing ... then I can really help you.
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    3. COyes, there are two prices for children. if they're with and adult they pay £30 but if they're on their own then they pay £39
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