20% of major airline companies equip their planes with wireless internet access. 70% of major airlines offer passengers free on-board snacks. What is the greatest possible percentage of major airline companies that offer both wireless internet and free on-board snacks? Choose the correct choice from the following
A) 20%  B) 30%  C) 40%  D) 70%  E) 90%
To maximize the percentage of companies offering both, let's assume that all 20% of companies which offer wireless internet also offer snacks.   The answer is 20%.
<result>A</result>
20% of major airline companies equip their planes with wireless internet access. 70% of major airlines offer passengers free on-board snacks. What is the greatest possible percentage of major airline companies that offer both wireless internet and free on-board snacks?