I want to update the price automatically without refreshing the page once the Qty has been changed. How to do this?
Dear in Magento you need to go to Product Edit option, and in Price tab you can see "Tier Price", here you can define the price for any number of quantity. you can as much you want. After saving this. You can notice from front end as you increase the quantity of your product price is also changes even you are in cart or just in Product page.