Joe Bidenbecame a U.S. senator in 1973 when senators were paid $42,500 per year. His last full year in the senate was 2008 when he was paid $169,300. The CPI values for every year since 1913 can be foundhereat the MinneapolisFed website.

What was the salary for 1973 equivalent to in 2008 dollars if you adjusted for inflation using the CPI?