Concept:Percentage is the ratio of a part to the whole, multiplied by 100.Explanation:Let the total number of pupils be x.The number of boys is 480, and this represents 80% of x.So, 80=x480×100.Multiply both sides by x: 80x=480×100.Divide both sides by 80: x=80480×100.Since 80480=6, we get x=6×100=600.Therefore, the total enrolment is 600 pupils.Answer:C. 600