Question 1

What is the mathematical difference between Gross Margin and Markup?

Accepted Answer

Gross Margin expresses profit as a percentage of the selling price: (Selling Price - Cost) / Selling Price × 100%. Markup expresses profit as a percentage of the cost price: (Selling Price - Cost) / Cost × 100%. A 50% markup on a $100 item yields a $150 price and a 33.33% margin.

Question 2

How do stacked discounts (e.g., 20% + 10%) work?

Accepted Answer

Stacked discounts are applied sequentially rather than additively. A 20% discount on $100 reduces it to $80; the second 10% discount applies to the remaining $80, yielding $72 (an effective discount of 28%, not 30%).

Question 3

How does the Reverse Tax (VAT/GST) extraction work?

Accepted Answer

To extract net price from a tax-inclusive gross amount, we divide by (1 + TaxRate/100). For example, with an 18% tax rate, a $118 gross price yields Net = $118 / 1.18 = $100, and Tax Component = $18.

Question 4

Are any of my financial or spreadsheet inputs sent to a server?

Accepted Answer

No! All calculations, sequence evaluations, and CSV exports execute 100% in-browser within volatile RAM memory with zero server telemetry or logging.

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