A2. A survey asked mathematics teachers how many years they have been teaching mathematics. The responses were illustrated with a bar chart. What percentage of teachers have been teaching for more than 5 but no more than 15 years?
(A) 15
(B) 30
(C) 40
(D) 55
(E) 70
A2. In the survey, 100 teachers were involved. 40 teachers have a work experience longer than 5 years and shorter than 15 years, which represents $40 \%$ of all teachers.