You have the following information about the three division that make up your company:

Division X Division Y Division Z

Beta $1\mathrm{.}05\mathrm{.}751\mathrm{.}30$

Additionally, you observe that the risk$-$free rate on $10-$year government securities is $4\mathrm{.}3\%$ and you estimate that the market equity risk premium is $5\mathrm{.}5\%.$ Please calculate the following as a percentage with two decimal points $($for example $4\mathrm{.}52\%)$

a$.$ Please calculate the divisional cost of capital Division X$.$

b$.$ Please calculate the divisional cost of capital Division Y$.$

c$.$ Please calculate the divisional cost of capital Division Z$.$

d$.$ Which of these divisions is the riskiest $($in terms of market risk$)?$ Division Y would be the riskiest division in terms of market risk.