How is eighty-seven percent written using the percent symbol?

Eighty-seven percent is represented with the percent symbol as 87%. The percent symbol (%) indicates a value that is a fraction of 100, so when you have the number 87 followed by the percent symbol, it clearly conveys that it reflects 87 out of 100 parts or units. This notation is standard for expressing percentages and is widely recognized.

In contrast, the other representations do not correctly convey the percentage. For instance, 8.7% represents a different value, which is less than 9 out of 100. The notation 0.87 represents the decimal form of a value that is the same as 87% but does not include the percent symbol, hence it is not formatted as a percentage. Lastly, 87.0 is a different representation of the number itself without the percent symbol, indicating it as an integer or a decimal without specifying a percentage. Thus, the option showing 87% correctly fulfills the requirement of expressing eighty-seven percent.