20% of the motorists who exceed the posted speed limit do not receive speeding tickets.
80% of those who exceed the posted speed limit GETS the ticket. this is given as 10% of all who exceeds so
0.1 * all = 0.8 * who exceed or
people who exceed/ all = 1/8 or 12.5%
Whether you think you can or think you can't. You're right! - Henry Ford (1863 - 1947)