Displaying the Percentage Character in Delphi's Format function

in Delphi TIPS :: Delphi's Format (declared in the SysUtils unit) function can be used to construct a formatted string assembled from a format string and an array of arguments. Here's how to make it display a "stand-alone" percentage character.

Read the full tip to find out how to display the percentage character in Delphi's Format function. Plus: how to fix the "Format '% ' invalid or incompatible with argument" error.

Related: SysUtils functions | TFormatSettings type | String Types in Delphi