Example
1. I sell business cards available in quantity of the following amounts by setting up a product option named amount.
100 Cards = £5.00
250 Cards = £10.00
500 Cards = £15.00
2. I have an additional option of lamination.
Matt = +£0 for 100 Cards
Gloss = £0 for 100 Cards
Soft = £5 for 100 Cards
If customer chooses 100 Cards at £5.00 + Matt Option at £2.00 total bill = £7.00 (All works good here)
HOWEVER
As my products vary for example
100 Cards + Soft Lamination = £15 + £5
250 Cards + Soft Lamination = £15 + £10
500 cards + Soft Lamination = £15 + £15
My Problem is how can I adjust the Lamination amount depending on the amount of cards chosen.