166 arms (178-12) of the sea lily were not damaged. This is 93.26% of the total number of arms.

Percent means “for every 100” or "out of 100." The (%) symbol as a quick way to write a fraction with a denominator of 100. As an example, instead of saying "it rained 14 days out of every 100," we say "it rained 14% of the time."

**Formula for calculating percentages**

The formula for calculating percentages or for converting from percentages are relatively simple.

Use this free online Percentage Calculator tool to calculate percentages.

See examples of percentage calculations at mathsisfun.com.