20×( 1+25%)

=25 (Ben)

There are 25 composition books.

If you agree with my answer,

Please adopt it in time, (click on the satisfactory answer icon above my answer)

Mobile phone users please comment "Satisfied" in the upper right corner of the client.

Your adoption,

It is my motivation to move forward!

Your adoption will also bring you wealth value.

If you don't understand,

You can ask questions until you understand the question!

If there are any new questions,

Please ask me for help (but don't ask here). The answer is not easy. Please forgive me. ...