If there are 664,579 prime numbers among the first 10 million positive integers, approximately what percent of the first 10 million positive integers are prime numbers? Choose the correct choice from the following choices
A) 0.0066%  B) 0.066%  C) 0.66%  D) 6.6%  E) 66%
664,579 = (x/100) * 10^7;   664, 579 = x * 10^5   =&gt; x = 664, 579/10^5   = 6.64579 ~ 6.6%   Ans is (6.6%).
<result>D</result>
If there are 664,579 prime numbers among the first 10 million positive integers, approximately what percent of the first 10 million positive integers are prime numbers?