Given a fraction you can figure out the equivalent percent:
FRACTION PERCENT 3/4 75% 2/5 40% 1/10 10% 1/20 5%
40% = 2/5 = 4/10 = 8/20 = 16/40 50% = 1/2 = 2/4 = 4/8 = 5/10 25% = 1/4 = 2/8 = 4/16 75% = 3/4 = 6/8 = 12/16 10% = 1/10 = 2/20 = 3/30
Now you get to try a few for yourself.