Help?!? Anyone Please - I'm desperate

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Our problem is almost the opposite, but it kinda makes sense to advertise it here...

- We have products in our catalog which have associated attributes.
- Some of these attributes add an amount of money to the cost of the   product.
- As it stands the basic cost and all attribute costs are addeded together and then multiplied by the quantity (wrong for us)
- For our application, if the more than one product is required, we only want to multiply the cost of  the basic item. The extra costs are a one off addition.

e.g.
1 item          = £10          + £2 + £4 + £1  = £17
3 items        = (3 x £10)  + £2 + £4 + £1  = £37
(not 3 items  = 3 x (£10   + £2 + £4 + £1) = £51)

I guess we need to edit the calculation equation somewhere, but where is it?!?

Is this all clear?