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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.$100margin 20%