Now this grasshopper is confused again,

Please, could one just example the below needed settings to show how (if this is now doable) a store that wanted all packages below 15 lbs to add 10% for the extra packing materials and all 15 lbs or more packages to have 20% added for packing material. And assuming that maximum large packages to be shipped is at 50 lbs. The store examples are the same for large or small packages. My mind has become mush and don't have any cheat sheet or the teachers addition book on hand at the moment.

Please make any necessary changes

Package Tare Small to Medium - added percentage:weight
What is the weight of typical packaging of small to medium packages?
Example: 10% + 1lb 10:1
10% + 0lbs 10:0
0% + 5lbs 0:5
0% + 0lbs 0:0
Answer:##############################

Please make any necessary changes

Larger packages - added packaging percentage:weight
What is the weight of typical packaging for Large packages?
Example: 10% + 1lb 10:1
10% + 0lbs 10:0
0% + 5lbs 0:5
0% + 0lbs 0:0
Answer:##############################