Task: Question Answering
Input (English): Problem: reena took a loan of $ . 1200 with simple interest for as many years as the rate of interest . if she paid $ 432 as interest at the end of the loan period , what was the rate of interest ? 
Options: a ) 3.6 , b ) 6 , c ) 18 , d ) can not be determined , e ) none of these
Output (English): b