### Solution to Problem 4:

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• \( e^{2.7} \approx 14.882 \)
• \( S(18) \approx 500 \times 14.882 = 7,441 \)
• #### 7441
• ### Solution to Problem 5:
• \( 0.65x = 1440 \Rightarrow x = \frac{1440}{0.65} \approx 2215.38 \)
• #### 2215

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