Trying To Find A "maths" Joke

[888]

It starts off about the percentages of £20 in £100 and ends with government rules and regulations. It was rather long and I saw it on here recently.

[Jomlett]

http://www.theanswerbank.co.uk/Phrases-and-Sayings/Jokes/Question1076873.html

[888]

that's the one Jomlett, thank you

[Jomlett]

You're welcome.