Percentage = (part ÷ whole) × 100
Find the part: part = (percentage ÷ 100) × whole
Find the whole: whole = part ÷ (percentage ÷ 100)
Example (find percentage): (25 ÷ 80) × 100 = 31.25%
Example (find part): 20% of 150 = (20 ÷ 100) × 150 = 30
Example (find whole): 30 is what percent of 150 = (30 ÷ 150) × 100 = 20%