i need help on the second question I figured out the first

2 pts Question 1 Given the following information regarding Builtrite's capital structure, calculate its weighted average cost of capital assuming a 40% tax bracket and target proportions. Target% 40% debt before tax) preferred stock common stock Cost 9.09 11.0% 18.0 % 10% 50% 12.70% 1126% 13.70% 12.26% WUSLIUIL The coefficient of variation should be used to measure the risk when: the means are unequal the units of data are unrelated the standard deviations are unequal the means are unequal and/or the units of data are unrelated