Find the percentage of a number:
Percentage × Number ÷ 100
Find what percent one number is of another:
(Part ÷ Whole) × 100
Convert a percentage to a decimal:
Percentage ÷ 100
Convert a decimal to a percentage:
Decimal × 100
Find the whole from a percentage of it:
Number ÷ (Percentage ÷ 100)
Find the part from a percentage of it:
Whole × (Percentage ÷ 100)