Daisy has half of her available funds invested in stock X$.$ Its expected return based on the CAPM is $16\%.$ Assuming a risk$-$free rate of $4\mathrm{.}5\%$ and market risk premium, expected market return minus risk$-$free rate of $10\%,$ if Daisy wants to achieve a portfolio with return equal to the market, she needs to invest the remaining half of her funds in a stock with a beta equal to$...$ what?