calculate_tariff_impact
ChatGPTUse this when a seller asks how a tariff or duty increase, or the end of a de minimis exemption, affects their margins, what a new rate they supply does to landed cost, or how much they would need to raise prices to keep their margin or profit per unit. Do not use to split an actual shipment's freight and duty, or to look up a tariff rate or HTS code. The user supplies the rates: either current and new duty rate columns per product, or one current and one new rate (as percentages) applied to every product. Needs products with SKU, unit cost and sell price; optional freight and other per-unit costs and annual units. Returns landed cost and margin before and after, the margin change, the price needed to keep the old margin percentage and the price needed to keep the old profit per unit, and the yearly cost increase when units are given. It does not know tariff schedules, HTS codes or which rate applies to a product. Read-only; stores nothing.
