In a exam 70% candidates passed in paper-I and 60% candidates passed in paper-II

In a exam 70% candidates passed in paper-I and 60% candidates passed in paper-II. 15% candidates did not passed any paper, while 270 candidates passed in both papers. Find out total number of candidates appeared in the exam?
(a) 600
(b) 580
(c) 560
(d) 540