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## Homework Statement

http://www.freeimagehosting.net/jqqoz

## Homework Equations

V(output) = V(input)(R2/R1)

## The Attempt at a Solution

The equation above is valid if the back part of the upper circuit (involving R3,R4 and the earth wire) does not exist. I tried to improvise with it by using the equation V(output) = V(input)(R2+1/(1/R3+1/R4))/R1 however the answer is wrong. Just need some guidance as to what I am doing wrong.