Alexander Bjørndal must be new here...
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Charlie and the Chocolate Factory
How about this?
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Charlie and the Chocolate Factory
Sum of (n/3^i) from i = 0 to i = ∞ But it gives 22.5 for 45 context 
Charlie and the Chocolate Factory
The formula is incorrect ... It assumes that money and wrappers can be used together to buy new chocolate context 