Liquidity Premium Hypothesis Based on economists' forecasts and analysis, one-year Treasury bill rates and liquidity premiums for the next four years are expected to be as follows:

R1 = 5.50%
E(r2) = 6.60%	L2 = .30%
E(r3) = 6.80%	L3 = .33%
E(r4) = 7.00%	L4 = .35%

Using the liquidity premium hypothesis, what is the current rate on a four-year Treasury security?