St. Martin's Hospital plans to purchase or lease a $2 million CT scanner. If purchased, the CT scanner will be depreciated on a straight-line basis over five years, after which it will be worthless. If leased, the annual lease payments will be $500,000 per year for five years. St. Martin's borrowing cost is 8%, and its tax rate is 21%.

The after-tax borrowing rate is closest to:

8%

10%

7%

9.7%

6.3%