Consider a 1-year zero-coupon bond Eindhoven that is subordinated and has a B rating. The historical recovery rate on subordinated bonds has been 42.4% and the historical default probability on B-rated bonds has been 0.4%, and this historical information is appropriate for bond XYZ. If the promised yield on bond XYZ is 8.5%, what should be the promised yield on a 1-year zero-coupon risk-free bond? All rates are annualized assuming a periodicity of 1 (i.e. annual compounding).

(If your solution is 4.44% then enter "4.44" as the answer. Precision is 0.01+/- 0.02.)