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You don’t apply the bonus on the sparks you earn at the end of the run. It is applied to the score in the spark run, and it can help you to reach another threshold and earn more sparks.
For example, on level 160, we have the following thresholds:
20.000
60.000
120.000
200.000
300.000
Each threshold awards 338 Sparks. The total possible is 1690.
If I score 40.000, without any bonus, I will reach only the first threshold and earn 338 sparks.
With all my bots with 140% promotion, the total bonus of 560% will be applied to my score in the run, so:
40.000 x (100 + 560) / 100 = 264.000
It will make me reach the 4th threshold, earning 1352 sparks (4 x 338)
In your case, it appears that you entered the astrotrain after reaching the 3rd threshold, and your bonus was enough to raise your score only to the 4th threshold.