Find the total number of positive integers of 4 digits or less that can be taken from the digits 1, 2, 3, and 4 in the case that
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gives an average cost per unit, if we want to produce x of them.
So for example, we want to produce 500 toy cars for our store, and we need a price per unit (per 1 toy car). What we do is we calculate C(500).
So to calculate the cost of one unit when producing 1250, we calculate C(1250)
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