In the examination, 1100 boys and 900 girls appeared, 50% of the boys and 40% of the girls pass. The fail percentage is ?

A. 54.5%
B. 45.5%
C. 45%
D. 60%

No of boys=1100
no of girls=900.
50% of boys= 50/100 * 1100=550
40% of girls=40/100 * 900= 360

therefore out of 2000 students (550+360) passed the exam

therefore out of 2000, 910 students passed.
now,

Percent of candidates failed= 2000-910/2000 *100
1090/2000 * 100

109/2

54.5%(Ans)