71828)
In this case, we know that the initial investment (P) is $800, the final amount (A) is $900, and the interest rate (r) is 9% or 0.09.
We can rearrange the formula to solve for t:
t = ln(A/P) / r
Using the given values:
t = ln(900/800) / 0.09
t ≈ 0.1054
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