In the formula \( A = 200(1 + 0.081)^{1 \cdot t} \), we can identify the variables and constants.
The general formula for exponential growth is \( y = a(1 + r)^t \), where:
- \( a \) is the initial amount,
- \( r \) is the growth rate,
- \( t \) is the time.
In the given compound interest formula, the term \( 0.081 \) represents the growth rate (as it is the portion added to 1 in the base of the exponential).
Thus, when comparing to \( y = a(1 + r)^t \), the part that compares best with the variable \( r \) is \( 0.081 \).
So the answer is \( 0.08 \).
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