A percentage is a dimensionless ratio expressed as a fraction of 100. Percentages are used to compare proportions, describe change, and express probabilities in a universally understandable format.
Percentage = (Part / Whole) × 100
Part = the value you are expressing as a percentage, Whole = the total or reference value, Result = percentage (0–100+)
Example 1: What percentage is 45 out of 180?
Result: 45 is 25% of 180
Example 2: A shirt costs $80 and is on sale for $60. What is the discount percentage?
Result: The shirt has a 25% discount
Example 3: What is 15% of $240?
Result: 15% of $240 is $36
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