Use reasoning to lead to the answer of the following question:
Walking across campus, a student interviewed a group of students. 25% of the students took a finance class last semester, 55% 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?\nOptions:\n(A) 60%\n(B) 50%\n(C) 25%\n(D) 20%\n(E) 10%

(D)
{Total} = {finance} + {marketing} - {both} + {neither}\n100 = 25 + 55 - {both} + 40\n{both} = 20%.

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Thus, the answer is (D)