A study was conducted on the efficacy and safety of varenicline for smoking cessation in people living with HIV. The study was a randomized, double-blind, placebo-controlled trial of the 123 subjects treated with varenicline, 16 abstained from smoking for the entire 48-week study period. Of the 124 subjects assigned to the placebo group, 7 abstained from smoking fom the entire study period. Complete parts (a) and (b) a. Find the sample percentage of subjects in each group who abstained from smoking for the entire study period.