(QUESTION) Let quantity-discount interact with attributes (QUESTION)

[jeroendielemans]

Hi people,

How can I let my quantity-discount interact with my attributes?

The problem is:

I have a discount with the purchase of more than 50, 100 and 250 products.
So I add the quantity-discount and this works as a charm.

The product is going to be printed, and the costumer has to choose in how many colours.

So I add 4 new attributes (color1, color2, color3 and color4).

Now the difficult part, the extra costs are variable!:

The extra money that has to be paid for each color increases with the same amount for 50 pieces.
So 50 pieces will cost:

50 pieces / color1 :10
50 pieces / color2 :11
50 pieces / color3 :12
50 pieces / color4 :13

But 100 pieces will cost you the folowing: (notice the decreasement of extra costs compared to 50 pieces)

100 pieces / color1 : 9
100 pieces / color2 : 9,75
100 pieces / color3 : 11
100 pieces / color4 : 12,25

And 250 pieces will also have a difference in the decreasement of extra cost compared to 100 pieces.

250 pieces / color1 : 8,50
250 pieces / color2 : 9
250 pieces / color3 : 9,50
250 pieces / color4 : 10

So the extra costs a color for each amount are:

50 pieces - 1
100 pieces - 0,75
250 pieces - 0,50

How can I let my costumer make a choice of color, which the shop detects and calculate in combination with the quantity discount?