A large box contains 20 small boxes and each small box contains 32 chocolate bars. How many chocolate bars are in the large box? Choose one.
A) 220	B) 490	C) 380	D) 450	E) 640

Rationale: "the only thing you have to do is a simple multiply we have : 20 * 32 = 640 correct answer is : e ) 640"
Answer: E