Task: Question Answering
Input (English): Problem: the income of a company increases 20 % per annum . if its income is 2664000 in the year 1999 what was its income in the year 1997 ? 
Options: a ) 2220000 , b ) 2850000 , c ) 2121000 , d ) 1855000 , e ) none of these
Output (English): e