@apujanata, what's the reasoning behind 1 million for remainder of life? Isn't the general rule a game makes 2/3 of its sales in the first 2 months? That would mean there's a remainder of 500k copies.
At 1.5 million units, and given the 60% allotment you assume, the 360 version should be at 900k copies.
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At 1.5 million units, and given the 60% allotment you assume, the 360 version should be at 900k copies.