In two successive years 100 and 75 students of a school appeared at the final examination. Respectively 75% and 60% of them passed. The average rate of pass is 


(a) 
68% 
(b) 
78% 
(c) 
80% 
(d) 
80 
In two successive years 100 and 75 students of a school appeared at the final examination. Respectively 75% and 60% of them passed. The average rate of pass is 


(a) 
68% 
(b) 
78% 
(c) 
80% 
(d) 
80 
Total number of students = 100 + 75 =175.
Number of students passed = 75% of 100 + 60% of 75
= 75 + 45 = 120.
Pass percentage =