Percentage = (Part ÷ Whole) × 100
Convert the result to a percent by adding %
To find the part: (Percentage × Whole) ÷ 100
To find the whole: Part ÷ (Percentage ÷ 100)
To find the percentage increase: [(New − Old) ÷ Old] × 100
To find the percentage decrease: [(Old − New) ÷ Old] × 100