Assume that the expected return on risky portfolio Z is $0\mathrm{.}2128,$ with the standard deviation at $0\mathrm{.}22.$ The expected risk$-$free rate is $0\mathrm{.}039.$ If

the investor chooses to borrow $100\%$ of their capital and invest it all in portfolio Z at the risk$-$free rate what is the expected portfolio return?

Enter percentages as a decimal to four decimal places without the $\%$ sign. $($eg; enter $12\mathrm{.}41\%$ as $0\mathrm{.}1241)$