Suppose $r_{RF}=9\%,r_M=15\%,$ and $b_i=$ Stock i$\text{'}$s beta $=1\mathrm{.}4.$

a$.$ Calculate $r_i,$ the required rate of return on Stock $i.$

b$.$ If $r_{RF}$ increases to $10\%$ and the slope of the SML $($Security Market Line$)$ remains constant, calculate $r_M$ and $r_i.$

c$.$ If $r_{RF}$ decreases to $8\%$ and the slope of the SML $($Security Market Line$)$ remains constant, calculate $r_M$ and $r_i.$

d$.$ Now assume $r_{RF}$ remains at $9\%,$ but $r_M$ increases to $16\%$ from $15\%.$ If the slope of the SML does not remain constant, calculate $r_i.$

e$.$ Now assume $r_{RF}$ remains at $9\%,$ but $r_M$ decreases to $14\%$ from $15\%.$ If the slope of the SML does not remain constant, calculate $r_i.$