Study the given pie-chart and answer the question that follows. The pie-chart below represents the actual number of students securing different grades in a science test.

Calculate the percentage of students who took the test and secured a D grade.

8

Total number of students = 4 + 15 + 23 + 8 = 50

Number of students secured D grade = 4

Percentage of students secured D grade = \(\frac{4}{50}\) × 100

= 8%