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Suppose that the market portfolio is equally likely to increase by 24% or decrease by 8%. Security AAA goes up on average by 29% when the market goes up and goes down by 11% when the market goes down. Security "Y" goes down on average by 16% when the market goes up, and goes up by 16% when the market goes down. Security "Z" goes up on average by 4% when the market goes up and goes up by 4% when the market goes down.The expected return on the market portfolio is closest to

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