Answer
please see details in "work step by step"
Work Step by Step
Exponential growth model: $A=A_{0}e^{kt},\quad k>0$
(where $A_{0}$ is the initial quantity, and $A$ is the quantity after time t)
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k defines the model (we need to find k).
$A$ is a function of t, $A(t)=A_{0}e^{kt} .$
We would use the information
($A_{0}=800,000, t=3, A(3)=1,000,000)$
to set up an equation:
$1,000,000=800,000^{k\cdot 3}$
which we would solve for k,
(we do not do this here as the text says to skip details),
after which the model will be obtained.
