You type only the yellow cells — exchange rate, FOB cost, freight, insurance, the tax rates for your HS code, clearing and transport, units and target margin. Everything else is a locked formula: CIF, duty on CIF, excise on CIF-plus-duty, IDF and RDL on CIF, and VAT on the running total — the correct sequence, not a flat percentage. A wrong rate is a one-cell fix, and the maths can't be broken by accident.
The bottom of each scenario is what actually matters: total landed cost, cost per unit, and the selling price that delivers your margin — with profit per unit and total profit spelled out. Change a supplier or a shipping mode and the comparison updates instantly, so you buy the option that actually makes money.