The percent change in the airborne lead concentration between 1980 and 2000 was closest to which of the
following?
a.
10%
b.
18%
c.
57%
d.
72%
e.
93%
![The percent change in the airborne lead concentration between 1980 and 2000 was closest to which of the following a 10 b 18 c 57 d 72 e 93 class=](https://us-static.z-dn.net/files/de4/494e74dc248324ee677a46c58123558b.png)