Answer:
c. 7.39%
Explanation:
Preferred dividend rate before tax = 8.4%
Tax rate = 40%
Dividend exclusion of = 70%
After-tax return = Preferred dividend rate [ 1 - (1-Dividend exclusion)*(Tax rate)
After-tax return = 8.4% [ 1 - (1-0.70)*(0.40)
After-tax return = 8.4% [1-0.12]
After-tax return = 8.4% * 0.88
After-tax return = 7.39%