eCommerce / price changed depending on number of additional items.

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OK - here's a tricky one, our client sells cushions and as well as having different pricing options depending on quality, size, etc which is straight forward enough, they want to charge per initial stitched on the item.

eg,

Item is $20
each initial is $2 extra

therefore to buy a cushion with Stuart embroidered on it would cost

$20 + 6 x $2 = $32

Suggestions gratefully received :)

Stuart