70% of the employees in a multinational corporation have VCD players, 75 percent have microwave ovens, 80 percent have ACs and 85 percent have washing machines. At least what percentage of employees has all four gadgets?  Choose the correct choice from the following answers:
A) 15%
B) 5%
C) 10%
D) 20%
E) 25%
Given a population where A% has a certain characteristic X and B% has another characteristic Y (assuming both aren't exclusive), then you get the minimum overlap by assuming that the entire population that doesn't have X has characteristic Y, therefore the minimum portion of the population that has both characteristics is:   B-(100-A) %   So given A=70 for employees with VCD players and B=75 for employees with microwave ovens, at least:    75-(100-70)= 
<gadget id="calculator"> 75-(100-70)</gadget>
<output>45</output>
45% have both. Then take the output and repeat with the other appliances.   A=45 for employees with both V10%D players and microwaves, B=80 for A10%s     80-(100-45)= 
<gadget id="calculator">  80-(100-45)</gadget>
<output>25</output>
25%   A=25 for employees with V10%D players, microwaves and A10%s, B=85 for washing machines   85-(100-25)= 
<gadget id="calculator">85-(100-25)</gadget>
<output>10</output>
10%   Answer 10%
<result>C</result>
70% of the employees in a multinational corporation have VCD players, 75 percent have microwave ovens, 80 percent have ACs and 85 percent have washing machines. At least what percentage of employees has all four gadgets?