Step 1: Write out the formula

Step 2: Substitute the given values
From the table, we can see that
![f(0)=a=36500\operatorname{km}^2]()
![\begin{gathered} f(5)=a(1+r)^5=53600 \\ \text{ This implies that} \\ 36500(1+r)^5=53600 \\ \text{thus} \\ (1+r)^5=(53600)/(36500) \\ \text{Therefore} \\ (1+r)^5=(536)/(365) \\ \text{thus} \\ 1+r=\sqrt[5]{(536)/(365)}\approx1.0799 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/nsy2shhsh7yx4jnxaym2h9mr16tblmylbk.png)

Therefore,

Step 3: Substitute time t = 40 into f(t)

Therefore, based on the data, the measurement that is closest to the number of square kilometers of land that will be occupied by cane toads 40 years after this is 800000