The percent gain is a 30% increase. You know this because if you need to add 3/10 to get from 5/10 to 8/10.
Codes of Chicalry is a code of conduct associated with the medieval institution of knighthood.
Hope this helped :)
One definition is that it is not really important to entire meaning of the given sentence and that it can never be shown/punctuated as its own sentence. Hope this helps;D
Well search up the words after it using context clues