My current equation is: (which is incorrect)
Purchase 1 x Apple = Shipping $5.00
Purchase 2 x Apples = Shipping $10.00 (wrong)
It should be if I purchase 2 x apples that the freight is not double but rather a percentage of the first $5.00 freight charge (say 50% of the $5.00 weight), would be charged.
The first apple is correct as we have to get the base rate of $5.00 for the shipping its the second item that should not be $5.00 again but rather a percentage.
Your buy DVD, the shipping of 1st is $5.00 add second DVD to cart the total shipping is $7.50 becuase they are sent in the same package.