In the percent proportion, the ratio of a part of something (part) to

the whole (base) is equal to the percent written as a fraction.

The part a = 2 

The base b = 8

Replace a with 2 and b with 8.

           (Means-extremes Property of proportion: If , then ad = bc.)

    (Divide each side by 8)

             (Cancel common terms)

                        (Simplify:)

Two is 20% of 8.