Task: Question Answering
Input (English): Problem: there are two concentric circles with radii 6 and 4 . if the radius of the outer circle is increased by 50 % and the radius of the inner circle decreased by 25 % , by what percent does the area between the circles increase ? 
Options: a ) 160 , b ) 210 , c ) 260 , d ) 310 , e ) 360
Output (English): c