I'd draw the table more like this
Metric Weight Percent Score Weighted_score
Leadership 40 40% 2 0.8
Punctuality 20 20% 2 0.4
Cleanliness 30 30% 2 0.6
Responsiveness 10 10% 2 0.2
Total 100 100% 2.0
Then remove one item and you don't have to change any weights, just calculate the new percentages and weighted scores:
Metric Weight Percent Score Weighted_score
Leadership 40 50% 2 1.0
Punctuality -- --% N/A ---
Cleanliness 30 37.5% 2 0.75
Responsiveness 10 12.5% 2 0.25
Total 80 100% 2.0
A percentage is just a type of weight but weights don't have to add up to 100 while percentages do. So dealing in weights that aren't (necessarily) percentages is more flexible and easier to understand when you have a problem like this.
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