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MathNet 2008-part-05 — 164 problems (EN–VI) Question 35

Math Olympiad Vault · MathNet 2008-part-05 — 164 problems (EN–VI)

Question 35

Alice and the Cheshire Cat play a game. At each step, Alice either (1) gives the cat a penny, which causes the cat to change the number of (magic) beans that Alice has from $n$ to $5n$, or (2) gives the cat a nickel, which causes the cat to give Alice another bean. Alice wins (and the cat disappears) as soon as the number of beans Alice has is greater than $2008$ and has last two digits $42$. What is the minimum number of cents Alice can spend to win the game, assuming she starts with $0$ beans?