In an examination, there are four subjects of 100 marks each. A student scores 78% in the first subject, 75% in the second subject and 90% in the third subject. She scored 85% in aggregate. Her percentage of marks in the fourth subject is:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e 97%.
Each subject is out of 100 marks, so total marks = 4 × 100 = 400
She scored 85% in aggregate → total marks obtained = 85% of 400 = 340
Marks in the first three subjects:
First: 78% of 100 = 78
Second: 75% of 100 = 75
Third: 90% of 100 = 90
Total of first three = 78 + 75 + 90 = 243
So, marks in fourth subject = 340 - 243 = 97
Percentage in fourth subject = (97 / 100) × 100 = 97%