I need to keep multiplying found values by two with a list and a value

Question

They gave me the first two lines of code. I thought I knew how to do it but I don't really understand what I'm missing.

class Solution:
    def findFinalValue(self, nums: List[int], original: int) -> int:
        if original in nums:
            for original in nums:
                original = original * 2
            print(original)
        else:
            print(original)
            
yeyo = Solution()
yeyo.findFinalValue()