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To Increase a stat by one point you take 1/10 of the stat, Multiply it by 100, and add 100 to find the gold amount needed to increase the stat by 1.
For example.
Sun Jian has a 98 Led Stat. In order to increase it by one, it is 1/10, AKA 9, multiplied by 100, and then add another 100, so it is 1000 gold to increase LED to 99.