Percentage = (Part ÷ Whole) × 100
Part = (Percentage × Whole) ÷ 100
Whole = (Part × 100) ÷ Percentage
Percentage increase = [(New value − Old value) ÷ Old value] × 100
Percentage decrease = [(Old value − New value) ÷ Old value] × 100
Percentage of a number = (Percentage ÷ 100) × Number