Task: Question Answering
Input (English): Problem: on a certain day , tim invested $ 500 at 10 percent annual interest , compounded annually , and lana invested 800 at 5 percent annual interest , compounded annually . the total amount of interest earned by tim ’ s investment in the first 2 years was how much greater than the total amount of interest earned by lana ’ s investment in the first 2 years ? 
Options: a ) $ 5 , b ) $ 15 , c ) $ 23 , d ) $ 100 , e ) $ 105
Output (English): c