Week 3: $ 81 \times 1.125 = 91.125 $
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- Thus $ n > 4.348 $ → smallest integer $ n = 5 $
- Week 1: $ 64 \times 1.125 = 72 $
- Week 2: $ 72 \times 1.125 = 81 $
- Week 4: $ 91.125 \times 1.125 = 102.515625 > 95 $
- Yes, by week 4 it exceeds 95%. But the question is: after how many weeks does it *first* exceed 95%?
- At the end of week 4, it exceeds. So after 4 weeks.
