12. As the dangers of smoking have become more widely known, clear class differences in smoking have
emerged. British government statistics classify adult men by occupation as "managerial and professional"(43%
of the population), "intermediate"(34%) or "routine and manual" (23%). A survey finds that 20% of men in
managerial, and professional occupations smoke, 29% if the intermediate group smoke, and 38% in routine
and manual occupations smoke. Use a tree diagram to find the percent of all adults British men who smoke.
(show answer as a percent with one decimal)