if the average professors salary at oregon state was 15,700 in 1975 when the CPU was 53.8 and was 52,500 in 1999, when was the CPI was 166.6, what was the real average professors salary in 1999 adjusted to the 1975 price level? 1. 15,380 2. 16,954 3. 28,245 4. 162,574