Task: Question Answering
Input (English): Problem: of the land owned by a farmer , 90 percent was cleared for planting . of the cleared land , 20 percent was planted with potato and 70 percent of the cleared land was planted with tomato . if the remaining 630 acres of cleared land was planted with corn , how many acres did the farmer own ? 
Options: a ) 7000 , b ) 6800 , c ) 8000 , d ) 5400 , e ) 7100
Output (English): a