First, you want to find a common denominator. The easiest way to do this is to multiple the two denominators together. A common denominator between these two fractions is 10. Two fifths times 2 is 4/10. 1/2 times 5 is 5/10. Add these two fractions together. 4/10+5/10= 9/10. That means 9/10 of the people are employees or their spouses. Now, 10/10 is one whole. You want to subtract 10/10-9/10. Your answer would be 1/10 of the people are now. Now to get your answer to a percent you have to divide 1 by 10. By doing this you get 0.1. Move the decimal 2 places to the right to get 10% of people are not an employee or spouse. Hope this helped!