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If you buy a car that costs 20,000 dollar, you do not say that the first kilometre costs you 20,000 USD. If you drive the car for four years and each year you drive 50,000 kilometres, you drive 200,000 kilometres. This means that the investment is 20,000 USD and the costs of the car are 10 cents per kilometre. We cannot mix the concepts of investment and costs. So the investments of the box is 20 dollars and the annual costs are 2 dollars. So the cost per tree are 2 dollars.

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