Question

The U.S. bureau has a station on Mauna Loa in Hawaii that has measured carbon dioxide levels since 1959. At that time, there were 313 parts per million of carbon dioxide in the atmosphere. In 2005, the figure was 386 parts per million. find the increase in carbon dioxide levels and the percent of increase.

Answer 1

Increase=higher-lower=386-313=73
percent increase=increase/original times 100=73/313 times 100=0.23322683706070287539936102236422 times 100=23.322683706070287539936102236422

so it is about 23% increase
the increase is 73