Task: Question Answering
Input (English): Problem: a tank contains 7,000 gallons of a solution that is 5 percent sodium chloride by volume . if 2,500 gallons of water evaporate from the tank , the remaining solution will be approximately what percent sodium chloride ? 
Options: a ) 4.77 % , b ) 5.77 % , c ) 6.77 % , d ) 7.77 % , e ) 8.77 %
Output (English): d