Answer :
If your "original" number is 27, this is the work:
percent change = change/original * 100
percent change = (36-27)/27 * 100
percent change = 9/27 * 100
percent change = 1/3 * 100
percent change = 33 1/3
percent change = change/original * 100
percent change = (36-27)/27 * 100
percent change = 9/27 * 100
percent change = 1/3 * 100
percent change = 33 1/3