the posted speed limit and receive speeding tickets,
but 20 percent of the motorists who exceed the posted
speed limit do not receive speeding tickets. What
percent of the motorists on the road exceed the posted
speed limit?
(A) 2
10 1 %
(B) 2
12 1 %
(C) 15%
(D) 22%
(E) 30%

The question is incomplete. Please repost.

On a certain road 10 percent of the motorists exceed
the posted speed limit and receive speeding tickets,
but 20 percent of the motorists who exceed the posted
speed limit do not receive speeding tickets. What
percent of the motorists on the road exceed the posted
speed limit?
(A) 2
10 1 %
(B) 2
12 1 %
(C) 15%
(D) 22%
(E) 30%

Number who exceed speed limit = E
Total motorists = M

20% of who exceed do not get tickets.
So, 80% of who exceed get tickets = 10% of total

80% of E = 10% of M
0.8E = 0.1M
E/M = 0.1/0.8 = 1/8 = 12.5%