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awk also has a printf function, which can take the standard formatting commands (see https://en.wikipedia.org/wiki/Printf_format_string#Type_field).

awk 'BEGIN{ printf("%.2f %%\n", 100*6697/547664) }'

Notes:

• The printf arguments are enclosed in parentheses since it is a true function.
• The 1st argument is the format string, enclosed in double quotes.
  • The %.2f format specifier says to output a floating point number with 2 digits after the decimal place.
  • The %% format specifier is used to output a single, literal percent sign.
  • Unlike the standard print statement, the printf function does not automaticlly append a newline to the output, so \n is added to the format string here.
• Remaining arguments to printf are the values to be substituted for the format specifiers.
  • Here just our percentage computation