Task: Question Answering
Input (English): Problem: rebecca ' s annual income is $ 20 , and jimmy ' s annual income is $ 10 , . by how much must rebecca ' s annual income increase so that it constitutes 55 % of rebecca and jimmy ' s combined income ? 
Options: a ) 8 , b ) 9 , c ) 7.77 , d ) 10 , e ) 11
Output (English): c