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(Figure: Income and Leisure Opportunities) The figure Income and Leisure Opportunities refers to Keisha when she has 100 hours per week for working or leisure. There are two-time allocation lines, one for a $10 hourly wage rate and one for a $20 hourly wage rate. Keisha's optimal choice is point A when the wage is $10, and her optimal choice is point C when the wage is $20. As the amount she earns increases from $10 to $20 per hour, Keisha will work _____ hours because of thesubstitution effect

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