If 213 × 16 = 3408, then 0.16 × 2.13 is equal to : Choose the correct choice from the following answers
A) 0.3408  B) 3.408  C) 34.08  D) 340.8  E) none of these

Rationale: "solution 0.16 × 2.13 = ( 16 / 100 x 213 / 100 ) = ( 16 x 213 / 10000 ) = 3408 / 10000 = 0.3408 . answer a"
Answer: A