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+/- indicators, identical to Git diff outputs.
Markup % = (Billing Price - Cost) / Cost. Profit Margin is the percentage of the final selling price that remains as profit: Margin % = (Billing Price - Cost) / Billing Price. For example, a 25% markup only yields a 20% profit margin. To achieve a true 20% margin on a $100 job, you must charge $125 ($100 / (1 - 0.20)).
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