Walking across campus, a student interviewed a group of students. 20% of the students took a finance class last semester, 45% took a marketing class last semester, and 45% took neither a finance nor a marketing class last semester. What percent of the students in the group took both a finance and a marketing class?
Choose the most appropriate option:
A) 60%
B) 50%
C) 25%
D) 15%
E) 10%
{Total} = {finance} + {marketing} - {both} + {neither}   100 = 20 + 45 - {both} + 45   {both} = 10%.   The answer is 10%.
<result>E</result>
Walking across campus, a student interviewed a group of students. 20% of the students took a finance class last semester, 45% took a marketing class last semester, and 45% took neither a finance nor a marketing class last semester. What percent of the students in the group took both a finance and a marketing class?