Percentage are broken in many cases because they are ambiguous, and often difficult to compose. +50% then -50% is not identity but ratio 3/4. A plain explicit

Percentage are broken in many cases because they are ambiguous, and often difficult to compose. +50% then -50% is not identity but ratio 3/4. A plain explicit ratio is sometimes better. Ratio in decibel, or "doubling number" can sometimes be valuable alternative, could be used more often. +1 doubling -1 doubling is identity. Same for decibels.