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Upgrading from level 17 to level 18, the cost for one wagon is 30 million.
Upgrading from level 18 to level 19, the cost for one wagon is 50 million.
Upgrading from level 19 to level 20, the cost for one wagon is 100 million.
The gap is huge!
Especially from level 19 to level 20, the price doubled, but upgrading to level 21 demands much less, only requiring 120 million units of iron ore.
Just 1.92 billion.
After ...
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