John makes $50 a week from his job. He earns a raise and now makes $70 a week. What is the % increase? Choose the correct choice from the following options
A) 16 %  B) 16.66 %  C) 18 %  D) 21 %  E) 40 %

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