A factory has 500 workers, 18 percent of whom are women. If 50 additional workers are to be hired and all of the present workers remain, how many of the additional workers must be women in order to raise the percent of women employees to 20 percent?
Choose the correct choice from the following answers:
A) 3
B) 10
C) 20
D) 30
E) 35
Currently the factory has 0.18*500= 
<gadget id="calculator">0.18*500</gadget>
<output>90</output>
90 women.   After 50 additional workers are hired, there will be total of 550 workers and we need 0.2*550= 
<gadget id="calculator">0.2*550</gadget>
<output>110</output>
110 of them to be women, so we need 110-90= 
<gadget id="calculator">110-90</gadget>
<output>20</output>
20 more women.   Answer: 20.
<result>C</result>
A factory has 500 workers, 18 percent of whom are women. If 50 additional workers are to be hired and all of the present workers remain, how many of the additional workers must be women in order to raise the percent of women employees to 20 percent?