Answer the following question, with explanation first.
John makes $40 a week from his job. He earns a raise and now makes $60 a week. What is the % increase?\nOptions:\n(A) 16%\n(B) 16.66%\n(C) 18%\n(D) 21%\n(E) 50%

(E)
Increase = (20/40)*100 = 50%.

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Thus, the answer is (E)