Current attendance: a simple percentage
Having attended 60 out of 100 classes held so far gives a current attendance of 60 ÷ 100 × 100 = 60%. This alone doesn't say whether you're on track for the term's actual requirement.
Projecting forward to the end of the term
With 50 classes remaining and a 70% requirement, the total classes by term's end will be 100 + 50 = 150, and 70% of that is 105 classes needed overall. Since 60 are already attended, 105 − 60 = 45 more classes are needed from the 50 remaining — leaving room to miss only 5 more classes and still hit the 70% target.
When the target isn't achievable at all
With the same 60/100 starting point but only 20 classes remaining and a 90% requirement: total classes by term's end would be 120, and 90% of that is 108 — needing 48 more classes from only 20 remaining. Since that's impossible, the result shows the target as not achievable, and caps the "must attend" figure at all 20 remaining classes rather than a number bigger than what's actually left.
Why this projection matters more than the current percentage
A current attendance below the requirement doesn't necessarily mean trouble — if enough classes remain, it's often still recoverable. The forward-looking calculation is what actually answers "can I still make it, and how much room do I have to miss class," which the current percentage alone can't tell you.