As a student investor, your portfolio has a beta of $1\mathrm{.}45.$ Your portfolio is made up of the following securities:

$15\%$ of your portfolio is invested in U$.$S$.$ Treasury bills

$31\%$ of your portfolio is invested in Stock Y

$54\%$ of your portfolio is invested in Stock Z

Note: Stock $Y$ has a risk level that is equal to the risk level of the overall market. Please find the beta of Stock B$.$ State your answer including two decimal places.

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