After an English exam, 9 percent of the test takers reported that they didn't study, while 10 percent of the test takers who didn't study refused to admit they hadn't studied. What percent of the test takers didn't study? Choose the most appropriate option:
A) 9%	B) 25%	C) 80%	D) 10%	E) 60%
Statement: 9% of Test Takers (TT) Reported they Didn't Study (RDS). Of the test takers who didn't study (DS) 10% refused to admit they didn't study (notRDT). [Note: A Venn Diagram is useful to visualize the problem.]   Solution: Sample space is 100%.   TT = 100%   R10%S/TT = 9%   notR10%S/10%S = 10% =&gt; 100% - 10% =&gt; R10%S/10%S = 90%   10%S/TT = (9)/(90)% = 10%   Answer: 10%
<result>D</result>
After an English exam, 9 percent of the test takers reported that they didn't study, while 10 percent of the test takers who didn't study refused to admit they hadn't studied. What percent of the test takers didn't study?