Performance of 1800 students in grades has been shown in the following pie chart.

The number of students getting grade B is what percentage of the number of students getting grade A?

90%

Number of students getting grade B = \(\frac{27}{100}\) × 1800 = 486

Number of students getting grade A = \(\frac{30}{100}\) × 1800 = 540

Required percentage = \(\frac{486}{540}\) × 100

= 90%