The correct option is A 6
In grade 4:
15% of the students like berries.
Total number of students = 40
So, number of students who like berries
=15100×40=6
In grade 5:
30% of the students like berries.
Total number of students = 40
So, number of students who like berries
=30100×40=12
∴ Difference of the number of students of grades 4 and 5 who like berries = 12 – 6 = 6
Hence, as compared to grade 4, there are 6 more students who like berries in grade 5.