There are 4 departments in class V of a school. The results of half-yearly and annual examinations according to the department are given in the table below.

Section	Number of students
	Students who failed in both the exams	Students who failed in half-yearly examinations only	Only students who failed in annual examinations	Students who passed both the exams
A	12	13	15	20
B	15	15	18	22
C	18	12	22	18
D	10	15	14	21

Which department has the minimum percentage of students passing both the examinations?