a friend of mine had me install and configure his zencart... we have it doing USPS rates plus a flat handling fee per box... now he wants to calculate a percentage of the (new) total cost (after shipping and handling has been considered once), and add that in as part of the handling fee
should I make changes directly to the USPS module? everytime I try putting P% into the handling fee slot, it ignores the % and just treats it as the per-box rate.
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