Walking across campus, a student interviewed a group of students. 25% of the students took a finance class last semester, 51% took a marketing class last semester, and 40% 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 one.
A) 60% B) 50% C) 25% D) 16% E) 10%
{Total} = {finance} + {marketing} - {both} + {neither}   100 = 25 + 51 - {both} + 40   {both} = 16%.   Answer: 16%.
<result>D</result>
Walking across campus, a student interviewed a group of students. 25% of the students took a finance class last semester, 51% took a marketing class last semester, and 40% 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?