If 18 is 15 percent of 30 percent of a certain number, what is the number?	Choose the correct answer.
A) 9  B) 36  C) 40  D) 81  E) 400
Let the certain number be x.   =&gt; (15/100)*(30/100)*x = 18;   450x=18*10000;   45x = 18000;   x=18000/45   =&gt; x=400;   Ans is (400).
<result>E</result>
If 18 is 15 percent of 30 percent of a certain number, what is the number?