A 20% apple juice is mixed with a 100% apple juice drink. The function f(x)= (2)(1.0)+x(0.2)/2+x models the concentration of apple juice in the drink after x gallons of the 20% drink are added to 2 gallons of pure juice. What will be the concentration of the Apple juice in the drink if 6 gallons of 20% drink are added? Give the answer as a percent but do not include the perfect sign (%).