English Core: 95 marks
Mathematics: 90 marks
Physics: 80 marks
Chemistry: 89 marks
Biology: 92 marks
Physical Education: 85 marks
Step 2: Calculate total marks secured.
Total marks = (95 + 90 + 80 + 89 +92 + 85) = 531.
Step 3: Calculate the maximum possible marks.
Since there were six subjects, each carrying 100 marks, the maximum possible marks are:
Maximum marks = 600.
Step 4: Calculate aggregate percentage.
Aggregate percentage = (Secured marks/ Maximum possible marks) * 100
Aggregate percentage = {(531 /600) *100} = 88.50%.
Therefore, the aggregate percentage obtained in class twelfth CBSE for the year 2004 is 88.50%.