$812 billion will be spent at the restaurants if the trend continues.
Explanation
It is given that the amount spent on restaurants increase by 6% every year.
The amount spent on each of the following years can be determined by solving it using the method used to calculate compound interest.
Amount spent in 2004=$510 billion
Annual rate of interest=6%
we have to calculate the amount spent in 2012
number of years n=8
Amount spent=