Set price depending on product weight
In my store the products selling by weight. Minimum - 100 gr.
I need the dropdown list(for example) with numbers - 100, 200, 300, ..., 1000. And price need to be change when i choose some weight. (i know that is possible to do this by setting weight like an attribute, but i need to have 1 product entity)
How can i do that? :(