Add Products Attribute with a higher price

I want to add an attribute to this product when ordering that allows the client to order: One Colour ad plate = $3.35 ea, if the client clicks on the attribute for Two Colours, the price then goes up to $3.95, Three Colours = $4.55 and so on.

Go to the product you want to do this for and click "Combination's" - From here you can add different elements that will allow you to increase the price of the product.