Algebra-2

Question Analysis
This problem evaluates the understanding of exponential decay and the application of the formula , where is negative for decay.

Key Concept Explanation
Exponential decay models a quantity that decreases by a fixed percentage over each equal time period. The general model is , where:
: The quantity after time periods;
: The initial quantity;
: The periodic decay rate (in decimal, negative for decay);
: The number of time periods.

Step-by-step Solution
1. Identify the given values: , , and

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