Consider the following spot interest rates for maturities of one, two, three, and four years.

r1 = 3.9%r2 = 4.5%r3 = 5.7%r4 = 6.0%

What is thepercentageforward rate f_(2,1), where f_(k,1) refers to a forward rate beginning in k years and extending for 1 year?

(Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.)