Task: Question Answering
Input (English): Problem: the revenue from sales items in 1996 increases by x percent , compared in 1995 and the revenue in 1997 decreases by x percent , compared in 1996 . if the revenue from sales items in 1997 decreases by 4 percent , compared in 1995 , what is the value of x ? 
Options: a ) 10 , b ) 15 , c ) 20 , d ) 30 , e ) 35
Output (English): c