This compares to 60% for my yahoo and google clicks. Anyone know why this would be?

I'm curious about advertising psychology and buying habits. Does anyone know the statistics associated with ppc advertising? What is the best location on the page to place the adds? next to photo? close to the left? or right? after a small intro to an article? I'm mostly interested in if people click adds on the left or right side of the page more often.
Thank You! Very Helpful indeed.

A photocopier wears out as it produces the copies. One model of copier costs $19931.30 to buy. it is designed to produce 1 million copies before it is ready to be replaced. If it depreciates at a rate of $7.60 per thousand copies, what is the value after 28,390 copies have been made, and what is the scrap value (value after its produced 1 million copies)