Percentages
Percentage and rule-of-three calculations with quick explanations.
Common uses
- Percent of a value: P% de X = (P/100)*X
- Increase: X_final = X * (1 + P/100)
- Discount: X_final = X * (1 - P/100)
- Which percent: P = (parte / total) * 100
- Direct proportion: A/B = C/X
- Inverse proportion: A*B = C*X
Tip: use negative values for discounts or opposite directions.