title: Update price automatically when quantity changed on product page Magento
body: <p>I am looking to have the product price automatically updated based on the quantity the customer has chosen.</p>
  
  <p>Currently when you choose a custom option in magento the price automatically updates but when choosing quantity this does not.</p>
  
  <p>So the scenario would be the product price is £10. User enters 3 quantity and automatically on the product page it updates the price to £30 and so on.</p>
  
  <p>Does anybody know of a simple way of updating this?</p>