3. Hilda Hornbill wants to invest her money in stock A and stock B. She assesses their prospects as follows:

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A B

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Expected return 20% 25%

Standard deviation 12% 15%

Correlation between returns -1.0

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If she wants to achieve an expected return of 24% on her portfolio, what would be the standard deviation of returns on her portfolio?

(No Excel please, need Steps) (no weights were given)