The White Flour Company mills wheat into flour. The equivalent units are measured in terms of tons of flour produced. At the beginning of the year, the mill contained 20 tons of flour that was 30 percent milled. During the year, another 500 tons of flour were completely milled. At the end of the year, the company has 40 tons of flour 80 percent milled.

How many equivalent tons of flour has the White Flour Company milled during the year?