Answer
2 cents per acre.
Work Step by Step
Represent the money paid to Russia in scientific form.
$7.2 million=7.2\times10^{6}$
Then divide sum that was paid with area to obtain price per acre.
$\frac{7.2\times10^{6}}{3.66\times10^{8}}=1.97\times10^{-2}=0.0197$
We can round that to $0.02 dollars per acre which is equal to 2 cents per acre.
