Some questions have a number of bonuses stated as percentages. For code golf (where the majority of these bonuses are seen) these will be percentage reductions of the score.
If an answer achieves several of these bonuses, how should the resulting score be calculated?
There are two main ways I can imagine:
Apply each percentage in turn
- 10% reduction followed by 20% reduction results in 90% of 80% = 72% of the original score.
Sum the percentages before applying them.
- 10% reduction and a 20% reduction results in a 30% reduction overall - that is 70% of the original score.
To me, (1) makes more sense, but it also happens to result in a higher score, so an answerer has an incentive to use (2).
Does it make sense to standardise here and settle on a default way, or should it be up to the question writer to specify each time?