A 20% discount on a 60% margin cuts the gross profit on every order by a third. Enter your numbers to see what the offer gives away, and whether the extra orders pay for it.

Gross profit = selling price less cost of goods. The same cost of goods and acquisition cost per order are used in both scenarios, and the discount applies to every promotional order. Contribution here means gross profit less the acquisition cost entered. Break-even orders are the promotional orders needed to match contribution without the offer; the gross-profit-only figure ignores acquisition cost and is shown for reference. The target tests each discounted order, while the comparison tests total contribution. Fulfilment, returns, payment fees and fixed costs are excluded. Expected orders are your assumption, not a demand forecast.