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Markup amount = cost × markup percentage ÷ 100. Selling price = cost + markup amount. Gross margin percentage = markup amount ÷ selling price × 100. Batch total = rounded selling price × quantity.- Apply the formulaMarkup amount = cost × markup percentage ÷ 100. Selling price = cost + markup amount. Gross margin percentage = markup amount ÷ selling price × 100. Batch total = rounded selling price × quantity.106.01 price, markup and marginMarkup Calculator uses the declared inputs to produce a transparent default result. Cost price: 80 per item; Markup percentage: 25 % on cost; Quantity: 1 items; Price rounding increment: 0.01 currency units; primary comparison: 80 and 25.