"..."
Chen Mang squinted slightly as he looked at the control screen.
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 the upgrade material consumption is halved, it is 960 million units of iron ore.
Once 960 million units of iron ore were pulverized within the train, the "armor" component smoothly reached level 21, providing a bit of extra peace of mind even when venturing into the pink zone. A level 21 armor can indeed provide a lot of security.
