Percentage = (Part ÷ Whole) × 100
Convert the result to a percent by adding the % sign
If finding a part from a percentage: Part = (Percentage ÷ 100) × Whole
If finding the whole from a part and percentage: Whole = Part ÷ (Percentage ÷ 100)
If finding percentage increase: ((New Value – Old Value) ÷ Old Value) × 100
If finding percentage decrease: ((Old Value – New Value) ÷ Old Value) × 100