What if our risky assets are still confined to the bond and stock funds, as in the last sec- tion, but we can now also invest in risk-free T-bills yielding 5%? We start with a graphical solution. Figure 7.6 shows the opportunity set based on the properties of the bond and stock funds, using the data from Table 7.1 and assuming that ρ = .3.Two possible capital allocation lines (CALs) are drawn from the risk-free rate (rf = 5%) to two feasible portfolios. The first possible CAL is drawn through the minimum-variance portfolio A, which is invested 82% in bonds and 18% in stocks (Table 7.3, bottom panel, last column). Portfolio A’s expected return is8.90%, and its standard deviation is 11.45%. Witha T-bill rate of 5%, its Sharpe ratio, which is theslope of the CAL, is