Let's imagine I have different tonnages of products I am shipping. 15000 lbs to 40000 lbs in 5000 lbs increments. On average to ship it cost $2.81 for a 100 lbs. How do I calculate how much each bracket is costing me? Is there a simple way to resolve this? I realize that there could be different combination possible but this is a real life problem for me right now. Thanks for any help.