In the past, the meaning of doubling was vague, but after the word was mentioned in the policy of making the country run towards a well-off society at the Twelfth National Congress, it became more clear in idioms. Mathematically speaking, it is the quadratic of 2, which is multiplied by 4. As your example, based on 100, doubling is 200, and doubling is also 200. Tripping three times should be understood as 300, and tripping three times should be understood as 800.

Example:

On the basis of 100, 1 time is 200, 1 time is 400, 1 time is 800, so tripling is 800.

On the basis of 100, 1 time is 200, 1 time is 300, 1 time is 400, so tripling is 400.

You can see the difference between double and double from this example.