A 34 - year - old man undergoes pulmonary function testing that does not reveal asthma. Your clinical suspicion is still high for asthma, so you provoke bronchoconstriction by performing the methacholine challenge test. Post – challenge FEV1 was 65%, at which point bronchodilator therapy was administered. Which of the following FEV1 values after bronchodilator therapy strongly suggests asthma?