How to input %% into a text file (with batch file)?

Question

This is a part of my code

echo for /f "tokens=*" %%A in ('dir /b') do (>>test.bat

When I executed it, it input:

for /f "tokens=*" %A in ('dir /b') do (

into the 'test.bat' file.

I was expecting %%A to be input. How can I do it?