Answer: 10.13%
Explanation:
The after-tax return on the preferred shares would be:
= After-tax return + Premium required
= (8.8% * (1 - 25%)) + 1%
= 7.6%
For the preferred stock to be issued at par with the above after tax return:
= After tax return / ( 1 - tax)
= 7.6% ( 1 - 25%)
= 10.13%