Task: Question Answering
Input (English): Problem: a man invests rs . 7,000 at the rate of 5 % per annum . how much more should he invest at the rate of 8 % , so that he can earn a total of 6 % per annum ? 
Options: a ) rs . 1200 , b ) rs . 1300 , c ) rs . 3500 , d ) rs . 2000 , e ) none of these
Output (English): c