The Perfect Roethlesberger?

The question was asked how Big Ben could have a perfect QB rating after completing 8 of 10 passing. Bear with me, here goes:

Take the completion % minus 30.
multiply by .05 to come up with 'A'

Take yds per attempt minus 3.
multiply by .25 to come up with 'B'

Take the touchdown %
multiply by .2 to come up with 'C'

Take 2.375 and subtract (interception % multiplied by .25)
to come up with 'D'

add A+B+C+D and divide by 6 then multiply by 100 and you'll find your answer.

It's that simple.