Question 11 • CUSD Advanced Math A (5.0)
The count on day n is 18 × 1.2^(n−1), since it starts at 18 and grows by 20% each day. On day 10, the count is about 18 × 1.2^9 = 93, which is still below 100. On day 11, it is about 18 × 1.2^10 = 111, so the count first exceeds 100 on day 11.
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