John makes $40 a week from his job. He earns a raise and now makes $60 a week. What is the % increase? Choose the correct answer.
A) 16 %	B) 16.66 %	C) 18 %	D) 21 %	E) 50 %

Rationale: "increase = ( 20 / 40 ) * 100 = 50 % . e"
Answer: E