"In two successive years 100 and 75 students of a school appeared at the final examination. Re
Channel: Doubtnut
Date: 05/04/2020

"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
`68 4/7%`
b. `78 %`
c. `80 %`
d. `80 1/2%`"