If 18 is 15 percent of 20 percent of a certain number, what is the number? Choose the correct choice from the following:
A) 9
B) 36
C) 40
D) 600
E) 400
Let the certain number be x.   =&gt; (15/100)*(20/100)*x = 18;   300x=18*10000;   3x = 1800;   x=1800/3   =&gt; x=600;   Ans is (600).
<result>D</result>
If 18 is 15 percent of 20 percent of a certain number, what is the number?