Correct Answer - Option 4 : 59%
Given:
Boys = 1200, Girls = 800
Passing percentage of boys = 45%
Passing percentage of girls = 35%
Formula used:
Failure Percentage = [(Total student – Passing student)/Total student × 100
Calculation:
Total number of student = 1200 + 800 = 2000
Total number of students pass = 45% of 1200 + 35% of 800
⇒ (45/100) × 1200 + (35/100) × 800
⇒ 540 + 280
⇒ 820
Numbers of student fails = 2000 – 820 = 1180
Percentage failure = (1180/2000) × 100
⇒ 118/2
⇒ 59
∴ The percentage of failure students is 59%.