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

r₁ = 3.8%

r₂ = 4.2%

r₃ = 4.9%

r₄ = 5.7%

What is the forward rate for 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. Show all calculations. Enter your answer as a percent rounded to 2 decimal places.)