A mathematical explanation of pricing based on target profit margins. The image shows how to calculate selling price (SP) from cost price (CP) and desired margin percentage. It includes a formula: SP = CP / (1 - Margin Target (%)), with an explanation that for a 20% margin, 80% of the selling price covers the cost. The image includes a worked example where CP = $80 and Margin Target = 20%, showing the calculation: SP = 80 / (1 - 0.2) = 80 / 0.8 = 100.
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