At a certain conference, 72% of the attendees registered at least
two weeks in advance and paid their conference fee in full. If
10% of the attendees who paid their conference fee in full did
not register at least two weeks in advance, what percent of
conference attendees registered at least two weeks in
advance? Pick one
A) 18.0%  B) 62.0%  C) 79.2%  D) 80.0%  E) 82.0%
0.72A -&gt; At least 2 weeks in advance and paid conference fee in full.   FA -&gt; Paid the conference fee in full   0.10FA -&gt; Not 2 weeks in advance paid but conference fee in full   =&gt; 0.90FA -&gt; 2 Weeks in advance and paid the conference fee in full   0.90FA = 0.72A   FA/A = 72/90 * 100= 
<gadget id="calculator">72/90 * 100</gadget>
<output>80</output>
80%   Answer - 80.0%
<result>D</result>
At a certain conference, 72% of the attendees registered at least
two weeks in advance and paid their conference fee in full. If
10% of the attendees who paid their conference fee in full did
not register at least two weeks in advance, what percent of
conference attendees registered at least two weeks in
advance?