A 34 yeаr оld wоmаn is recоvering from severe covid pneumoniа, she has been receiving ventilatory support for 3 days. Current Fio2 is 60% (0.6), and her Pao2 on this settings is 200 mm Hg. What change in Fio2 would achieve a target PaO2 of 80 mm Hg?