Percentage = (part ÷ whole) × 100
Convert the fraction to a decimal if needed
Multiply the decimal by 100
Add the percent sign %
To find a part from a percentage: (percentage ÷ 100) × whole
To find the whole from a part and percentage: part ÷ (percentage ÷ 100)
To find percentage increase: ((new − old) ÷ old) × 100
To find percentage decrease: ((old − new) ÷ old) × 100