Luisito Inc. is a multinational corporation. Luis Ramos is the CFO and has the following information available to him:

Risk free rate	3.30%
Credit risk premium	4.10%
Domestic beta	1.14
International beta	0.84
% Debt in optimal capital structure	40%
Return domestic market portfolio	9.10%
Return global market portfolio	8.00%
Before-tax cost of debt	6.35%
Effective tax rate	33%

Using the domestic CAPM, what is Luisito's after-tax cost of debt? (Enter in percentage terms- use two decimal places in your answer)