B) 45.5%

C) 45%

D) 60.5%

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%**

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