how do I go about solving this problem? Lorenz Curve and Perfect Distribution Curve 100 lifted curve

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how do I go about solving this problem?

Lorenz Curve and Perfect Distribution Curve 100 lifted curve portoct 70 Robin Hood Index A Proportion of Total Salaries 50 40 30 10 10 20 10 40 50 70 100 Percent of Players 11. What is the slope of the tangent line to the Lorenz curve at the r-value where the Robin Hood Index is computed? Explain why this is the case