in reply to Please Help! This is a class assignment given to me.

Please see Elementary arithmetic as well as Percentage for a point to start. If this is too much effort you may ask your local favorite pizza dealer for a practical example.

«The Crux of the Biscuit is the Apostrophe»

perl -MCrypt::CBC -E 'say Crypt::CBC->new(-key=>'kgb',-cipher=>"Blowfish")->decrypt_hex($ENV{KARL});'Help