Two numbers are respectively 20% and 50% more than a third number. The percentage that is first of the second is? Choose the correct choice from the following
A) 77%  B) 78%  C) 79%  D) 80%  E) 81%
I II III   120 150 100   150----------120   100-----------? =&gt; 80%   Answer:80%
<result>D</result>
Two numbers are respectively 20% and 50% more than a third number. The percentage that is first of the second is?