title: Woocommerce product price update after cart quantity increase
body: <p>I have a product in my shop page after adding it to cart i want to change the quantity of that product. But the product price should be increased by 50% of the main product.
  For example if product price is 100 and after increasing its quantity to 2 then product price should be 150. and on 3 it should be 200.
  How can i change that in woo-commerce. </p>