Increasing a price based on number of products ordered

[voodoo1967]

Hello All,

Ive hit on a problem and I think I may be stuffed on this one.

What I am trying to do is :-
Customer selects a product , this product has a value of Zero to start then the customer then selects the quantity they want to order lets say for example 10, 50 or 100 , so for 10 the price is 3.60 and for 100 it's 34.00 , once the customer has chosen the quantity they must decide on the thickness of the product , if they select standard - the price stays the same , but if they select double then the price needs to increase by double what ever the price is .

But remember this price will be different depending on what the quantity was
so for example if the cost is 3.60 I need to be able to double it to 7.20 but also if the cost was 34.00 I also need to be able to double it to 68.

Any ideas how or if this is possible?