Kevin bought a $20,000,26-week T-bill at a discount rate of 6.2% on August 2 . He sold it 8 weeks later at a discount rate of 6.7%. Find Kevin's purchase price, the discount 8 weeks later when he sold it, the proceeds to Kevin, and the effective interest rate for the time he held the note. (Hint: Treat T-bills as a discount note.) Kevin's purchase price was $ (Round to the nearest cent as needed.) The discount when Kevin sold the note was $463.85 '. (Round to the nearest cent as needed.) The proceeds to Kevin were $ The effective interest rate for the time Kevin held the note was (Round to the nearest hundredth as needed.)