Calculation note
Margin arithmetic is simple, but pricing mistakes often come from naming the wrong denominator. A visible record separates selling price, discount, cost, profit, margin and markup so a quote can be challenged before it becomes an invoice.
Margin reads profit as a share of selling price
Gross margin asks how much of the net selling price remains after direct cost. That makes it useful for product lines, quotes, classroom exercises and quick approval checks.
Markup starts from cost instead
Markup is useful when building a selling price from cost, but it is not the same as margin. Showing both percentages prevents a common pricing error.
A printable margin record keeps approvals clean
When discount, cost basis, quantity and target margin are printed beside the result, a manager, student, supplier or tradesperson can see exactly which assumption drove the price.