The given bar-graph shows the number of boys and girls in classes A, B, C and D in a school, the number of teachers allotted to each class and the number of students promoted to the next class.

Which class has the highest percentage of failed students?

B

In class A ,

Total number of students = 27 + 31 = 58

Number of failed students = 58 - 43 = 15

Percentage of failed students = \(\frac{15 }{58}\) × 100 = 25.86%

In class B ,

Total number of students = 35 + 30 = 65

Number of failed students = 65 - 45 = 20

Percentage of failed students = \(\frac{20 }{65}\) × 100 = 30.76%

In class C ,

Total number of students = 30 + 32 = 62

Number of failed students = 62 - 58 = 4

Percentage of failed students = \(\frac{4 }{62}\) × 100 = 6.45%

In class D ,

Total number of students = 33 +34 = 67

Number of failed students = 67 - 61 = 6

Percentage of failed students = \(\frac{6 }{67}\) × 100 = 8.95%

So , highest percentage of failed students is in class B .