A portfolio has a standard deviation of 20% and an expected return of 18%. The risk-free rate is 4%.

An investor has the following utility function: U equals E left parenthesis r right parenthesis minus left parenthesis A divided by 2 right parenthesis asterisk times sigma squared , where A is the risk-aversion parameter of the investor. Which value of A makes this investor indifferent between the risky portfolio and the risk-free asset?

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