Task: Question Answering
Input (English): Problem: on a sum of money , the simple interest for 2 years is rs . 660 , while the compound interest is rs . 696.30 , the rate of interest being the same in both the cases . the rate of interest is : 
Options: a ) 10 % , b ) 10.5 % , c ) 12 % , d ) none of these , e ) can not be determined
Output (English): d