To find last year's revenue before the 15% increase, we can use the formula for percentage increase:
If this year's revenue is \( R \) and it increased by \( p% \), then the last year's revenue \( L \) can be calculated using the following relationship:
\[ R = L \times (1 + \frac{p}{100}) \]
Here, \( R = 80,000 \) and \( p = 15 \).
Rearranging the formula to solve for \( L \):
\[ L = \frac{R}{1 + \frac{p}{100}} \]
Substituting in the values:
\[ L = \frac{80,000}{1 + \frac{15}{100}} = \frac{80,000}{1.15} \]
Now we calculate \( L \):
\[ L \approx \frac{80,000}{1.15} \approx 69,565.22 \]
Rounding to the nearest dollar gives us approximately $69,565.
Thus, the answer is \( \boxed{B} \).
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